Dhawaan, kooxda cilmi-baarista Professor Xiao Zhengguo ee Dugsiga Fiisigiska ee Jaamacadda Sayniska iyo Teknolojiyadda Shiinaha, Shaybaarka Muhiimka ah ee Fiisigiska Qalabka Quantum ee Adag ee Akadeemiyada Sayniska ee Shiinaha iyo Xarunta Cilmi-baarista Qaranka ee Hefei ee Sayniska Qalabka Microscale ayaa ka dhigay muhiim. horumarka berrinkii diyaarinta hufan perovskite crystal halLEDs.

Kooxda cilmi-baarista ayaa koray tayo sare leh, aag weyn iyo ultra-khafiif ah perovskite hal crystals iyadoo la isticmaalayo habka xaddidaadda booska, iyo diyaariyey perovskite hal crystal LED iftiin ka badan 86000 cd / m2 iyo nolosha ilaa 12500 h ee markii ugu horeysay, kaas oo qaaday tallaabo muhiim ah oo ku wajahan codsiga perovskite LED in aadanahaiftiimin. Guulaha laxidhiidha, ee cinwaankiisu yahay "Dood-dhaliyeyaasha iftiinka-firfircoon ee hal-crystal ah oo dhalaalaya oo deggan", ayaa lagu daabacay Nature Photonics Febraayo 27-keedii.

Birta halide perovskite waxay noqotay jiil cusub oo soo bandhiga LED ah iyo agabka iftiiminta sababtoo ah mawjada dhererkeeda la hagaajin karo, ballac badhkeed oo cidhiidhi ah iyo diyaarinta heerkul hoose. Waqtigan xaadirka ah, waxtarka tirada dibadda (EQE) ee perovskite LED (PeLED) ee ku salaysan filimka khafiifka ah ee polycrystalline ayaa dhaaftay 20%, marka loo eego LED-ga ganacsiga (OLED). Sanadihii la soo dhaafay, nolosha adeegga ee ugu badan ee la soo sheegay waxtarka sare ee perovskiteQalabka LED-kawaxay u dhaxaysaa boqolaal ilaa kumanaan saacadood, oo wali ka dambeeya OLEDs. Xasiloonida aaladda waxaa saameyn doona arrimo ay ka mid yihiin dhaq-dhaqaaqa ion, dhejinta sidaha oo aan dheeli tirnayn iyo kulaylka joule ee ka dhasha hawlgalka. Intaa waxaa dheer, dib u habeynta Auger ee halista ah ee aaladaha polycrystalline perovskite waxay sidoo kale xaddideysaa iftiinka aaladaha.

Iyadoo laga jawaabayo dhibaatooyinka kor ku xusan, kooxda cilmi-baarista Xiao Zhengguo waxay isticmaaleen habka xaddidaadda booska si ay u koraan perovskite hal kiristaalo oo ku yaal substrate-ka goobta. Iyadoo la hagaajinayo xaaladaha koritaanka, soo bandhigida aminyada organic iyo polymers, tayada crystals ayaa si wax ku ool ah loo hagaajiyay, sidaas darteed diyaarinta tayada sare ee MA0.8FA0.2PbBr3 kiristaalo khafiif ah oo leh dhumuc yar oo ah 1.5 μ m. Qalafsanaanta dusha sare waa in ka yar 0.6 nm, iyo soosaarka quantum fluorescence gudaha (PLQYINT) wuxuu gaaraa 90%. Qalabka LED-ka ee perovskite-ka ah ee loo yaqaan 'crystal LED' oo lagu diyaariyey hal kristaalo oo khafiif ah maaddaama lakabka iftiiminaya uu leeyahay EQE 11.2%, dhalaal ka badan 86000 cd/m2, iyo cimriga 12500 h. Waxay markii hore gaadhay heerkii ganacsi, waxayna noqotay mid ka mid ah aaladaha LED-ka ee perovskite ugu xasilloon xilligan.

Shaqada kor ku xusan si buuxda u muujinaysaa in la isticmaalayo perovskite khafiif ah crystal hal sida lakabka iftiiminaya iftiinka waa xal macquul ah in dhibaatada xasiloonida, iyo in perovskite crystal LED hal rajo weyn berrinkii nalalka aadanaha iyo bandhigay.