Transparent near-infrared light-emitting diodes:
Near-infrared (NIR) covert illumination is increasingly important for facial recognition, motion sensing and depth sensing functions in mobile devices. However, these NIR illumination sources, which are usually non–transparent LED chips, occupy valuable space and could lead to unsightly black notches on an otherwise full-area color display.
[...] Their devices employ an ultra-thin layer of a novel perovskite-based semiconductor, which is capable of intense and efficient light emission. This perovskite semiconductor also benefits from low-cost processing and versatile integration into a variety of device substrates. By further replacing the traditional non-transparent metallic electrode with a new electrode comprising layers of ultra-thin metals and conductive oxide, the team is able to achieve an optimal balance of high optical transparency, low electrode resistance, and efficient charge injection that are required for the LED to generate light efficiently.
Mr Xie Chenchao, a Ph.D. student on the research team said, "We found that the implementation of a thin aluminum interlayer in our transparent electrode greatly reduced plasma damage to our device during the electrode deposition process, and allowed our devices to function efficiently."
Journal Reference:
Chenchao Xie, Xiaofei Zhao, Evon Woan Yuann Ong, et al. Transparent near-infrared perovskite light-emitting diodes [open], Nature Communications (DOI: 10.1038/s41467-020-18110-7)
(Score: 3, Insightful) by DannyB on Wednesday August 26 2020, @01:43PM (4 children)
Off Topic. TFA is about IR light, not UV light.
Too much IR light might cause red skin or blisters.
But now I've done it --- "red skin" is an offensive term that can result in getting
blacklisted$**tcanneda trophy for participation.People today are educated enough to repeat what they are taught but not to question what they are taught.
(Score: 2, Funny) by Anonymous Coward on Wednesday August 26 2020, @02:02PM
Oh la de dah! UV, IR, whatever. Light is light. Dark is dark. Anything in between is liberal wishy-washy trans-bullshit.
(Score: 1, Troll) by Azuma Hazuki on Wednesday August 26 2020, @02:24PM (2 children)
You're a whiner. And I see you going down the same path Runaway did in the future at this rate. How long until you're writing essay-length screeds about your "freedom of speech being under attack" at this rate? And as far as participation trophies go...Millennials didn't invent those. THEIR BOOMER PARENTS DID. So that's a nice own-goal there.
I am "that girl" your mother warned you about...
(Score: 4, Insightful) by DannyB on Wednesday August 26 2020, @03:38PM (1 child)
The "trophy for participation" was intended only to get a laugh. Nothing more.
I agree that the people GIVING the trophies for participation are to blame, not the recipients of those trophies.
People today are educated enough to repeat what they are taught but not to question what they are taught.
(Score: 0) by Anonymous Coward on Thursday August 27 2020, @12:20AM
Only retarded kids think that getting a plastic medal someone's dad is handing out out of a black trash bag is worth a damn. You and your excellent brain also managed to see through the ruse - well done.