#Electroluminescence

[materialsscienceandengineering]

Strategy uses boron-nitrogen covalent bonds to enable high-performance narrowband electroluminescence

To meet the demands of next-generation ultrahigh-definition displays, the organic light-emitting diodes (OLED) industry is actively pursuing the development of narrowband organic light-emitting materials. Within this effort, multiple resonance thermally activated delayed fluorescence (MR-TADF) materials based on boron-nitrogen fused polycyclic aromatic hydrocarbons have gained prominence for their energy efficiency and color purity, capturing the interest of both academia and industry. However, these materials often display long excited-state lifetimes, which can cause severe quenching of triplet excitons and thus reduce device efficiency. Addressing this issue while maintaining narrowband emission remains a crucial challenge. To tackle this, a research team led by Professor Chuluo Yang and Associate Professor Xiaosong Cao at Shenzhen University has introduced a π-conjugation extension strategy using boron-nitrogen covalent bonds, focusing on innovative molecular structures. The team's paper is published in the journal National Science Review.

Read more.

[inkintheinternet]

The Modern Alchemist

By Arjuwan Lakkdawala

Ink in the Internet

It is said that the arrow of time always travels in one direction, time and the events that unfold in it are linear. The First Law of Thermodynamics states that the energy in the whole observable universe is the same, except it changes its state, like when you burn firewood and it turns to smoke. The Second Law of Thermodynamics states that Entropy increases and is irreversible, like when you break an egg, and that systems always go from orderly to disorderly.

And then there is the matter of reaching equilibrium, like when you pour milk into a cup of tea, the milk will flow through it till it is evenly spread.

When scientists study any phenomena, the wisest know that the main objective should be to find principles and laws about how a certain entity, or system functions, this is very difficult, and could be considered the greatest secrets of the world as we know it.

Why the fundamental laws are so elusive and mysterious we don't know, but it is clear that whenever scientists were able to establish (even if to a certain percentage) a law or principle, it was a catalyst for inventions, technology, and scientific developments.

The history of scientific studies dates way back to a branch of the science of the time called 'Alchemy" originating from the Arabic 'Al Kimia." In present day Arabic the word means 'Chemistry.'

Historical records state that Alchemy very likely started in Egypt and Arabia, and then the knowledge was passed down to Rome and ancient Greece, and then to the west. However, whatever were the scientific endeavours of the original Alchemists, it became generally indistinguishable from the other non-scientific ideas and theories that are part of Alchemy.

Western medieval Alchemists had three priorities; Find the Philosopher's Stone - which they believed has supernatural powers, find the Elixir of life and youth - possibly using the stone, transform common metals into silver and gold.

While these are fantastical aspirations, somehow the experiments that the ancient Alchemists did with the elements, was the start of sciences like pharmacology, metallurgy, and chemistry.

I do think there is a linear learning connection throughout the past centuries, and into the future, perhaps a pattern of the methods of discoveries, or fragments of information that will fit together like pieces of a puzzle.

In this century scientists and thinkers are the Modern Alchemists, and chemistry is the real scientific Alchemy.

But do we still try to attain things that seem on the boundaries of the supernatural - while I was going through the collection of H.G. Wells books, I read The Invisible Man, a masterpiece like his previous books that I have read.

(Spoiler Alert)

In the science fiction story he explains invisibility through chemistry, and I have seen various movies with similar ideas, the most memorable to me is the beloved Walt Disney classic: 'Now You See Him, Now You Don't,' and the Hindi classic: Mr. India.

In the first it is invisibility through chemistry, and in the second it's invisibility through the bending of light.

The two movies sum up the whole business of hypothetical invisibility by light and chemistry.

My interest sparked by Wells and the movies, I found invisibility really interesting to explore scientifically and I did a web search.

A 2022 Big Think article came up in the search, titled: 'Invisibility Cloaks Are Not Just Possible, But Are Becoming Reality'

Feels like the quest for the Philosopher's Stone, or the Elixir of Life (Modern Alchemists at work)

Perhaps this is a pattern of human curiosity that won't stop even at what appears (or literally doesn't appear) impossible.

The writer mentions science fiction invisibility in Star Trek, and goes on to explain a scientific project involving cutting edge technology, materials, and lenses.

The aim of the project is to combine "Metalenses with Metamaterials"

Metamaterial will be engineered using nanotechnology to bend light, while the Metalense will pace the wavelenght speed of each colour of light (invisible in white light) to appear again as white light after passing over the Metamaterial.

To give a more precise description:

The reason is that each colour of light has its own speed, and this is why a prism is shaped to split white invisible light into a rainbow because they don't travel through the prism at the same speed. The Metalense will balance the speed to equilibrium and so it will appear as white light again. 

When travelling in a vacuum the different wavelengths of light can travel at the same speed but not when going through a medium.

We are in 2024 so I'm guessing the "invisibility cloak" which I think will be like the one in Harry Potter, is still in the making, pretty much like Alchemists trying to turn common metals into gold.

When it comes to nature camouflage is the closest thing to invisibility so far discovered.

The relation of colours, wavelengths of light, and nano structures will require volumes of books, but I have a few fascinating brief examples. The colour blue that we see is an illusion caused by nano structures, and most of the time in nature when you see blue it is iridescence, and not a pigment, it generally doesn't exist as a pigment like the other colours.

Bats hunt moths with radar like sound waves that detect them, so to counter this there are moths with hairy coating which deflect the sound waves - making it invisible to the bat.

In technology stealth planes are designed to deflect radar detection like moths, so they are invisible to radars.

However, I found more astonishing than all this was the creation of light by chemistry; such as bioluminescence and chemiluminescence. The first happens in living things, and the latter in non-living.

Light of this type is 'cold light' (very low heat.)

But how is it used for camouflage - well here comes the Hatchet Fish, it has organs that create light and point downwards, so that its silhouette against the surface of the ocean is camouflaged (in this case called counterillumination) as sunlight, and predators swimming below cannot distinguish it. Organs like these are called 'photopores.'

Another sea creature the Brittle Star uses the bioluminescence it can make in a rather ingenious type of camouflage or a decoy, that is when it is threatened by a predator it detatches a glowing arm (which it can regrow) and leaves the predator following the arm while it sneaks away.

The sea cucumber detaches its luminescencent parts on other fish, so the predator follows the glowing fish instead of it.

Bioluminescence is produced by the compound luciferin; with a chemical reaction either with the enzyme luciferase or the chemical photoprotien.

An example of chemiluminescence is the element phosphorous, officially discovered by the German alchemist Hennig Brand in 1669, when he was trying to create the Philosopher's Stone, he named the element from the Greek meaning "bearer of light" because it glowed. White phosphorous is highly flammable and toxic.

Glow-in-the-dark toys and products have phosphor. How it glows is like this: when light is shone on phosphor, its electrons get excited and are dislodged from their 'ground state' to 'intermediate state' and when they return to the ground state the energy of this is emitted in the form of the glow, it is more precisely termed 'electroluminescence.'

Arjuwan Lakkdawala is an author and independent science researcher.

X/Instagram: Spellrainia

Email: arjuwan.writer@gmail.com

Copyright ©️ Arjuwan Lakkdawala 2024

Sources:

Flights of Fancy by Richard Dawkins

Big think - invisibility cloaks are not just possible, but are becoming reality, ethan siegel

Royal society of chemistry - what is alchemy

NIH - National institute of general medical sciences, biomedical beat blog, phosphorous: glowing, flammable, and essential to our cells, abbey bigler-coyne

Britannica - philosopher's stone, written and fact-checked by the editors of Encyclopaedia Britannica

Britannica - alchemy, pseudoscience, robert p. multhauf, robert andrew gilbert,

Fact-checked by the editors of Encyclopaedia Britannica

Ocean conservancy - here comes the hatchet fish, billy unotti, former communications assistant

National geographic, bioluminescence

Science direct - chemiluminescence, and overview,

Science world, chemical light reactions

Secondary article, the science behind glow-in-the-dark toys

[mercurialbadger]

The joke is that Actuating Current Powder Electroluminescent devices are leaky capacitors instead of leaky diodes, so instead of light-emitting diodes they are

.... Light Emitting Capacitors.

[frogshunnedshadows]

Today's ASMR clicky sounds & blinky lights video stars a vintage, Apollo era DSKY. I find that display nice to look at, and pleasant to hear. Skip to 34:04 for maximum blinky-clicky-ness.

[carsthatnevermadeitetc]

Volkswagen ID.3 Harlequin Edition, April 1, 2024. The Harlequin paint made famous in the 1990s with the Volkswagen Polo is to return as an option for the electric ID.3 with an electroluminescent twist. The ID.3 Harlequin’s panels will light up and pulse in response to beats from the car’s sound system and integrate with the new ChatGPT functionality being rolled out across the Volkswagen range. The limited-edition ID.3 Harlequin is available from April 1; designs can be viewed on Volkswagen’s online configurator using the code ‘JEST 1’.

[accessibilitysolutionsca]

Bright Solutions: Photoluminescent Exit Signs

Illuminate escape routes with photoluminescent exit signs, harnessing ambient light to remain visible even in blackout scenarios. These signs require no external power source, providing a reliable, cost-effective solution for emergency egress.

[ikkosu]

G1 Wheeljack with human reader who conducts silly little experiments like Nilered does :3

Ex: https://youtu.be/LmAG8-V_WQY?si=1EU4d5B6NLclxKJh

https://youtu.be/NIVkBs7oWDI?si=Oyuj50EpNKTFycfH

WHEELJACK.READER

hi foxy!! how dare you make me learn chemistry/j

"Alright, kid. You can go right ahead and ignore that flask. Don't, worry. It's not gonna pop. So, what we want to do is—"

It did, indeed, pop. Vehemently, too. An explosion rattled the laboratory. More specifically, from the same flask he told you to ignore and now the entire room is cloaked with...dust? Yellow, jaundice dust floating around, opaque and thick.

You blink and hacked, flapping a hand to clear away the smog. You make out Wheeljack's silhouette amidst the daze. He's also trying to clear out the air with his servos, vents chuffing, equivalent of a sneeze.

"That's. That's suppose to happen, right?"

His 'gills', or that's what you call it, at least, flares up as he spoke. He's still clutching the green vial in his hand.

"What's suppose to happen?"

"The explosion? The dust? Half of the base's missing a left wing?"

"Oh, yeah. That." He scratches his helm, humming, swivelling around. As you said, there would be — a good chunk of the room had been blown off. How the two of you managed to survive that was beyond him.

"Could be because I set the burner too high."

You narrowed your eyes. "The manual said minimal, at most, though."

You weren't even sure if he was aware a manual existed, in the first place.

"Hm?" He snaps to you, blue optics widening a little. " It said minimal? Swore, I read it as maximum..."

"How did you even—"

The laboratory was unceremoniously barged through. A dark silhouette of red emerges from the fog. Perceptor skids across the floor, hacking and flapping a servo to clear the air as he scampered towards you.

" What is the meaning of this?" He's on the verge of strangling Wheeljack the moment he sees him. "And, why wasn't the alarm working?!"

"Oh, right. The alarm. Figured I'd used it for spare parts—"

"Spare parts!?"

"We'll put it back, though." Was your assurance and held up what's left of the concocted alarm to his face.

He doesn't seem assured once after skimming across the chunk of wall blown apart and his alarm brutally slaughtered. The sharpshooter stands there, distraught and baffled. His servos twitched and you were sure, if he had his gun, it'd definitely go off.

"What did you do?" His optics dangerously flicker to you and your science buddy..

"An experiment." Wheeljack simply replies. The green vial sloshing as he moves. "Conjuring something the humans would call interesting."

Perceptor is silent but the look on his face clearly says why? But of course, you didn't get the memo and started rambling off. Perceptor is now staring at the blown up wall and simultaneously digesting your words.

"....and, we heated up the white phosphorus, which clearly was set too high on temperature, thanks for that Wheeljack, in order to get Red-P. Then, after — the electroluminescent coating for this stink bomb we are working on—"

"Your what?"

[materialsscienceandengineering]

In research that could lead to a new age in illumination, researchers from Japan and Germany have developed an eco-friendly light-emitting electrochemical cells using new molecules called dendrimers combined with biomass derived electrolytes and graphene-based electrodes. Their findings were published in the journal Advanced Functional Materials. Electroluminescence is the phenomenon where a material emits light in response to a passing electric current. Everything from the screen you're using to read this sentence to the lasers used in cutting edge scientific research are results of the electroluminescence of different materials. Due to its ubiquity and necessity in the modern age, it is only natural that extensive resources go into research and development to make this technology better. "One such example of an emerging technology is 'light-emitting electrochemical cells' or LECs," explains Associate Professor Ken Albrechtfrom Kyushu University's Institute for Materials Chemistry and Engineering and one of the leads of the study. "They have been attracting attention because of their cost advantage over organic light emitting diodes, or OLEDs. Another reason for LECs popularity is their simplified structure."

Read more.

[shieldfoss]

Analyzing Spectral Electroluminescence Sensitivities of SiC MOSFETs and their Impact on Power Device Monitoring - https://publications.rwth-aachen.de/record/854485/files/854485.pdf

[timetrek24]

🇺🇲 Step back in time to the era of wearable tech with the Fossil Wrist PDA! Released in 2003, this innovative smartwatch ran Palm OS and boasted a Motorola DragonBall Super VZ 66 MHz CPU.

⌚️ The AU/FX series offered robust PDA functionalities, seamlessly synchronizing with PCs and featuring an infrared port, virtual keyboard, and touch screen—delivering a truly immersive user experience.

✒️ Sporting a graffiti handwriting recognition system, the Wrist PDA also housed a tiny stylus in its clasp, alongside navigation buttons and a rocker switch for effortless menu navigation. With a screen resolution akin to a Palm III and an electroluminescent backlight, it ensured usability day and night.

⚙️ Furthermore, this multifunctional device doubled as a TV remote via Palm applications, although with limited range. Its built-in watch program offered a variety of "watch faces" to suit every style.

💵 With a debut price of $249, the Fossil Wrist PDA epitomized cutting-edge technology and style, capturing the imagination of tech enthusiasts and fashionistas alike.

[kaaaaaaarf]

wip poll winner: Murder Husbands

So this is way longer than the 22 sentances I was supposed to post, but I got carried away with things, and well....here you go. Freshly written, unedited snippit from the next chapter of Murder Husbands, inspired by this tik tok video. (cw: mature themes)

Remus has been in what you might call a slump. He just hasn't felt much like himself lately— this happens from time to time. He has a lot going on in his life, between his cat sitting business, helping out Sirius with his art students, and the plotting and execution of murder. Most people don’t realise that murder properly undertaken takes a lot of energy and planning. Remus is just running on empty and in desperate need of something to brighten his spirits. When one of his favourite kids in Sirius’ class started talking about his Ticky-Tock videos, Remus knew that it was just the thing to turn his week around. Teddy explained that Ticky-Tocks were short videos to share with friends. He played a few for Remus, and he especially liked the ones with people dancing. He didn’t have a ton of friends, but he did have Sirius. He wanted to make a really cool Ticky-Tock for him. He had Teddy help him download the application to his phone, set up an account and show him the basics on how to record.  As soon as he got home, he prepared himself to record. He already knew the perfect song, but he needed to put on his best duds. He chose his form-fitting blue jeans and a simple white, short sleeve button up, paired with his favourite striped, burgundy sweater vest over top. He put on his Casio A168W ElectroLuminescence (it’s water and blood resistant— technology is insane) and his favourite pair of glasses to complete the look.  He fumbled with his new iPhone (a gift from Sirius on his birthday), positioning it against the exposed boards on the wall inside of the west servant’s passage, and double checked how he looked onscreen (suave, as always). Once he was satisfied that his phone wouldn't fall over, he set it to play Everything She Wants and began his carefully choreographed performance, perfectly on beat with the song. He shakes his hips seductively and lip-syncs along. When he’s done, he watches it back and is pleased with how well it turned out. He posts the video to his account and sends a link to Sirius. He feels so much better now. He thinks he might have the strength to finally set about getting rid of Mitch’s body. Just in time too— it was starting to smell. **** Sirius receives the text message from Remus while he is out to dinner at Chez L’éponge with some work colleagues. He plays the attached video through once, hiding his phone under the table as he does. He freezes once the video finishes, and has to excuse himself to hide in the bathroom so that he can watch it again. It’s a Tik-Tok video of Remus, set to a Wham! Song, with the caption Whammin’ in bold letters across the top. Sirius watches as Remus awkwardly shuffles backwards, clapping his hands and pointing at the camera rhythmically, doing a dance that Sirius could only describe as a rendition of the Monster Mash. He is looking at the camera with intensity from behind his horn-rimmed glasses and has a smear of dried blood on his cheek that also seems to be speckled on his sweater vest. Sirius licks his lips and then plays it a third time. Then a fourth. God, there is something so irresistible, so alluring in the way that Remus moves like a baby giraffe that just figured out how to stand on its own legs. Sirius has to hurriedly lock himself in a cubicle while he whacks off to Remus Whammin’, the video playing on repeat until he comes with a groan that he tries to smother with a bitten lip. When he’s done, he exits the stall and washes his hands. Before he goes back out to re-join his coworkers, he replies to the message from Remus with an emoji thumbs up.

@kaleidoscopexsighs, @spindrifters, @fruityindividual, @grimjobs and @lynxindisguise are the ones who tagged me for the original survey!

[fruityyamenrunner]

Bodies taking their colour from:

molecular absorption: look around you

molecular emission: i thought this one would be hard because most molecules fall apart before you excite them enough to glow, but there are also chemiluminescent, sonoluminescent and electroluminescent effects, so this is probably also look around you

atomic emission: slightly harder but you're probably not very far from a tube with some tenuous gas in it which would present an atomic spectrum to you if provoked using the apparatus provided. you can also put some salts in a flame.

atomic absorption: this seems like the hard one. I don't think there would be any cases where you could see this because atomic absorption lines are very thin and sparse. obvious exception is if you use monochromatic light, but even then the only instance of this I have heard of is if you illuminate a sodium fire (free Na+ in the corona of the flame) with a brighter sodium lamp -- the flame is black.

Related question: what are the spectra of salts like generally? Presumably the greater the ionic nature of their bonding, the more atomic their spectra look, but how far does that go?

[alex99achapterthree]

Dark Aircraft...

Dark F-4 PHANTOM II.

The green strips are formation lights. Made up of electroluminescent panels, their brightness can be controlled from the cockpit or turned off entirely. They can't be seen from a distance and help other aircraft stay in formation when the rest of the lights on the aircraft are turned off.

As is their custom, military pilots have given the lights their own name. They refer to them as "slime lights".

[stalemateserial]

The display was amoral. It was many things: electroluminescent, helpful, logical, but not moral. It took no pleasure or remorse from whatever numbers its circuitry compelled it to display. Right now, that number was 58. Judith, however, all flesh and blood and dreams, did not much care for that number. It was better than 57, but not by much.

Circadian rhythms, too, are amoral. Chiefly, however, they are difficult to break, which was why Judith was, at this moment, alone in the cramped space dedicated to leisure. To know Ruth had no conscious intention to keep her waiting offered no comfort. She did not know the time, nor did she much care to know. From the window of the station, reinforced with layers of perpetually clear polymer, the sun was always visible, and so for her purposes, she lived in an eternal daytime.

The interior of Titania had far more room than the first crewed flights of the Space Programme, although if Judith were to put her mind to it, she likely could have laid the five feet and eight inches that made up her entire being--at least in the vertical sense--from one end of the compartment to the other. Her black hair would drift into collusion with the wires that trailed from one monitor to the next, overlapping like the ghosts of a choreographed routine, her pale skin jaundiced in the gold light.

She waits.

Content with elongated periods of isolation, including under duress, Judith was left trying to keep her mind away from certain words. Many of them had such negative connotations; "catastrophic", "impossible", and "limited" drift across her thoughts like the millions of specks she watches float in the vacuum surrounding her.

Sight is all she has. The constant, unending hum of circulating air has ceased to be maddening. It is a constant so anticipated it has all but disappeared entirely. The air maintains an equilibrium now undetectable on her skin. Titania was built for efficiency, not comfort, after all. But because there is so little noise she cares to hear, Judith immediately recognizes when it is broken. There is a stirring from further down the chassis, beyond the lamplit corridor that leads to the sleeping quarters. The unmistakable sound of a body propelling itself through space, crossing thresholds with single-minded determination. The hiss that erects a semblance of privacy, then the pneumatic crescendo of waste removal.

Without further ado, Ruth Schechter drifts into view. She brushes her hair, its length and color making it look like she's allowed a bushy owl to roost on her shoulders, out of her face. Her shirt is disheveled and her legs bare, and Judith has never been more relieved to see anyone.

"Pawn to F three," Ruth announces, when she's come close enough to warrant a greeting.

Judith raises an eyebrow. "Pawn to E six."

Ruth, content, continues on past, likely intent on finding something to eat. Judith follows, her mind having gratefully found something to latch itself onto.

[azzandra]

Chapters: 1/1 Fandom: Original Work Rating: Teen And Up Audiences Warnings: No Archive Warnings Apply Characters: Original Characters Additional Tags: Science Fiction, Science Fantasy, Magitek, Stand alone story, Banter, Worldbuilding Series: Part 3 of Transit Summary:

intricacy.jove: He just ate a disquette!!!!!!!

welya.2020: lmao ate a disquette

intricacy.jove: Don't laugh, I'm terrified right now! I didn't know they did that! Is this normal?

welya.2020: hlod on that wasnt a typo, man just chowed down on a disquette?? plastic and all?

Or, an alien walks into a music shop.