Lub Kaum Ib Hlis 25th, pab neeg ntawm xibfwb Wei Zhanhua los ntawm Lub Tsev Haujlwm ntawm Luminescent Materials thiab Information Display, thiab Lub Tsev Kawm Ntawv ntawm Cov Khoom Siv Science thiab Engineering, Huaqiao University, thiab pab pawg ntawm xibfwb Edward H. Sargent, Department of Electronic thiab Computer Engineering, University. ntawm Toronto, koom ua ke luam tawm ib qho kev tshaj tawm hauv online nyob rau saum toj kawg nkaus thoob ntiaj teb kev kawm ntawv journal Nature. Cov ntaub ntawv tshawb fawb Kev faib khoom tswj tau ua kom muaj txiaj ntsig zoo txo - qhov ntev perovskite LEDs. Qhov kev ua haujlwm no ua tiav qhov kev txhim kho tseem ceeb hauv kev ua haujlwm thiab lub neej ntawm perovskite LED cov khoom siv los ntawm qhov tsis xws luag passivation thiab luminescence center dimension kev tswj, thiab xav tias yuav siv rau cov khoom tshiab thiab teeb pom kev zoo yav tom ntej.
Nature is one of the most influential academic journals in the world, dedicated to reporting and commenting on the most important breakthroughs in global scientific research. It is worth mentioning that in 2018, Huaqiao University published the official journal of Nature as a correspondence unit for the first time. Three years later, Huaqiao University once again published a paper in Nature as a communication unit, marking that the school's scientific research level has been significantly improved and it has entered the fast lane of sound development.
Hlau halide perovskites muaj cov khoom zoo heev optoelectronic, xws li cov molar extinction coefficient, ntev cov cab kuj tsiv mus nyob deb, tunable zog band sib txawv, thiab siab tsis xws luag kam rau ua, thiab muaj dav daim ntawv thov kev cia siab nyob rau hauv lub teb ntawm lub hnub ci hlwb thiab lub teeb -emitting diodes . Hlau halide perovskites tuaj yeem muab faib ua xoom-dimensional, qis-dimensional thiab peb-dimensional raws li qhov sib txawv ntawm cov qauv siv lead ua microscopic. Ntawm lawv, tsawg- cov khoom siv perovskite muaj quantum confinement nyhuv, loj exciton khi zog, tsis yog -radiative recombination tsis yooj yim rau tshwm sim, thiab luminous efficiency siab.
Txawm li cas los xij, txhawm rau tsim kom muaj txiaj ntsig zoo thiab ruaj khov qis -dimensional hlau halide perovskite cov ntaub ntawv rau lub teeb- emitting li, tseem muaj ob qhov kev sib tw loj: ib qho yog qhov muaj qhov tsis xws luag, uas yuav ua rau lub tsim ntawm non-radiative recombination chaw, uas ua rau ion tsiv teb tsaws, thiab Nws muaj txiaj ntsig zoo rau lub luminous efficiency thiab stability ntawm lub cuab yeej; Qhov thib ob yog tsim ntawm multiphase sib xyaw quantum qhov dej, uas yuav ua rau kev hloov pauv ntawm lub zog ntawm qhov dav ntawm qhov sib txawv quantum zoo mus rau qhov nqaim band sib txawv quantum zoo nyob rau hauv kev kho qhov muag thiab hluav taws xob excitation, uas ua rau dissipation, uas yog tsis conducive rau lub luminescence. ntawm tus ntaus ntawv. Efficiency, xim purity.
Daim duab 1. Daim duab kos duab ntawm txheej txheem tsim zaj duab xis ntawm peb hom perovskite lub teeb-emitting films, uas PEA sawv cev rau phenethylammonium ntsev, TPPO sawv cev triphenylphosphine oxide, thiab TFPPO sawv cev tris(4-fluorophenyl) phosphine oxide.
In order to improve the performance of low-dimensional perovskite LED devices, Edward H. Sargent's team from the University of Toronto and Wei Zhanhua's team from Huaqiao University jointly proposed a surface passivation-well width control strategy for low-dimensional metal halide perovskites. As shown in Figure 1, in the anti-solvent-induced crystallization process, PbBr64-, MA plus and Cs plus ions first form perovskite precursor flakes, and then PEA plus organic cations interact with the precursor flakes to form low-dimensional perovskite luminescence. film.
Hauv pab pawg neeg siv, kev tsis sib haum xeeb, nrawm nrawm ntawm PEA ntxiv rau cov organic cations ua rau kev tsim cov chaw tsis raug thiab quantum zoo cov qauv ntawm qhov tsis sib xws. Hauv pab pawg sim, P=O daim ntawv cog lus hauv TPPO thiab TFPPO cov molecules tuaj yeem cuam tshuam nrog perovskite precursor flakes los ntawm P=O:Pb2 ntxiv rau kev sib cuam tshuam, tswj cov txheej txheem crystallization thiab txo cov tiam ntawm chaw kho mob. Tsis tas li ntawd, ntau pawg F hauv TFPPO tuaj yeem cuam tshuam nrog PEA ntxiv rau cov organic cations, uas ua lub luag haujlwm ntawm kev tso tawm qeeb ntawm cov ntaub ntawv raw thiab retardation ntawm crystal kev loj hlob, thiab thaum kawg tsim ib tug siab - zoo perovskite lub teeb{{4} } emitting zaj duab xis nrog qhov ntev sib xws.
Daim duab 2(a) Schematic qauv, cross-sectional TEM duab thiab schematic daim duab ntawm lub zog theem qauv ntawm perovskite LED li; (b) sib thooj tam sim no-voltage curves, brightness-voltage curves thiab sab nraud quantum efficiency ntawm peb perovskite LED li- Brightness curves; (c) statistical distributions ntawm sab nraud quantum efficiency ntawm peb perovskite LED li; (d) tam sim no-voltage curves ntawm peb perovskite ib leeg-electron thiab ib leeg- qhov khoom siv; (e) TFPPO-raws li Kev khiav hauj lwm lub neej nkhaus ntawm perovskite LED li.
Raws li qhia hauv daim duab 2, zaj yeeb yaj kiab no muaj cov khaub ncaws hnav thiab ntom ntom nti thiab ntom ntom nti yog 51} Sab nraud quantum efficiency ntawm cov khoom siv ntsuab LED npaj tau siab li 25.6 feem pua, thiab lub neej ua haujlwm tau nce mus txog 2 teev ntawm qhov ci ntawm 7,200 cd m-2, deb tshaj li ntawm cov khoom siv zoo sib xws tau tshaj tawm txog tam sim no.
Xib fwb Wei Zhanhua tau hais tias nyob rau hauv ob peb xyoos dhau los, cov cuab yeej ua haujlwm thiab kev ua haujlwm lub neej ntawm perovskite LEDs tau zoo dua, tab sis tseem muaj txoj hauv kev mus ntev. Nyob rau hauv lub neej yav tom ntej, ntau tus kws tshawb fawb yuav tsum tau ua hauj lwm ua ke los txhim kho qhov ruaj khov - lub xeev tso zis kev ua tau zoo, siab - cov cuab yeej ua tau zoo dua thiab ntau - xim spectral tso zis kev ua tau zoo ntawm lub cuab yeej.
Nyob rau hauv daim ntawv no, Dr. Ma Dongxin, tus kws kho mob tom qab kawm tiav ntawm University of Toronto, yog thawj tus sau. Nws tau ua ib -xyoo mus tshawb fawb ntawm Huaqiao University; Dr. Lin Kebin los ntawm Huaqiao University yog tus kws sau ntawv thib ob thiab kuj tau ua haujlwm tseem ceeb rau txoj haujlwm no. Prof. Edward H. Sargent thiab Prof. Wei Zhanhua yog cov kws sau ntawv. Kev tshawb fawb ua haujlwm tau txais kev txhawb nqa los ntawm National Natural Science Foundation ntawm Tuam Tshoj, Natural Science Foundation ntawm Fujian Xeev thiab Kev Tshawb Fawb Txog Kev Tshawb Fawb ntawm Huaqiao University.
