Tsis ntev los no, xibfwb Xiao Zhengguo' s kev tshawb fawb pab pawg los ntawm Lub Tsev Kawm Ntawv Physics ntawm University of Science thiab Technology ntawm Tuam Tshoj, Lub Chaw Kuaj Xyuas Kom Zoo ntawm Kev Ntsuam Xyuas Cov Quantum Khoom Siv Hluav Taws Xob ntawm Suav Academy ntawm Kev Tshawb Fawb thiab Hefei National Tshawb Fawb Chaw rau Microcale Khoom Siv Khoom Siv Kev Tshawb Fawb tau ua tiav qhov tseem ceeb hauv kev ua liaj ua teb loj-npaj ntawm perovskite LEDs.
Cov pab pawg tshawb xyuas tau siv cov cua riam-pab cuam squeegee txoj hauv kev los npaj thaj chaw loj, muaj peev xwm ua haujlwm tau zoo ntawm cov hluav taws xob perovskite LED, uas yog cov kauj ruam tseem ceeb rau kev coj mus muag ntawm perovskite LED teeb pom kev zoo. Cov txiaj ntsig ntsig txog tau muab npe" Qhov loj-thaj chaw thiab txuag hluav taws xob ntau qhov sib txuas ntawm cov duab hluav taws xob tsawg-kub hniav-txheej" thiab tau luam tawm nyob rau hauv phau Ntawv Xov Xwm Kev Sib Txuas Lus rau Lub Ib Hlis 8.
Hlau halide perovskite LEDs tau dhau los ua cov cim tshiab ntawm LED khoom vim lawv qhov zoo xws li cov xim dav gamut, kev kho kom yooj yim ntawm cov kis kab, nqaim luminescence ib nrab-qhov dav dav, thiab yooj yim ntawm kev npaj. Hauv 2014, nws tau tshaj tawm thawj zaug uas perovskite LEDs uas tawm ntawm lub teeb nyob rau hauv chav tsev muaj qhov teeb meem sab nraud quantum efficiency (EQE) tsawg dua 1%. Hauv ob peb xyoos xwb, EQE ntawm perovskite LEDs tau dhau 20%, uas yog ze rau kev lag luam organic LEDs (Qib OLED) tau nthuav dav daim ntawv thov kev cia siab nyob rau hauv kev teeb pom kev zoo thiab tso saib.
Txawm li cas los xij, tam sim no high-efficiency perovskite LEDs yog txhua qhov tsim tawm raws li tus txheej txheem kiv kiv, thiab thaj chaw cov khoom siv me me heev (raws li kev txiav txim siab ntawm mm2), uas tsis tuaj yeem ua tau raws li qhov xav tau ntawm thaj chaw loj coj teeb pom kev zoo. Cov hniav txheej txheej yog txheej txheem txheej txheem daws teeb meem los npaj cov chaw loj, tab sis cov txheej txheem crystallization ntawm perovskite zaj duab xis npaj los ntawm cov hniav txheej txheej tsis yooj yim los tswj. Lub EQE ntawm cov npaj tau perovskite LED tsuas yog 1.1%. Cov khoom siv thaj chaw tsuas yog 9mm2.
Hauv kev teb rau cov teeb meem saum toj no, Xiao Zhengguo pawg neeg tshawb nrhiav coj cov organic-inorganic hybrid perovskite CH3NH3PbI3 raws li cov khoom tshawb nrhiav. Los ntawm kev txo qhov kev cia siab ntawm perovskite tus ua ntej, 4-fluorobenzylamine tau qhia thiab ua ke nrog huab cua riam cov txheej txheem los ua cov txheej txheem crystallization txheej txheem ntau qhov chaw nucleation tau tsim nyob hauv nruab nrab, yog li npaj ib qho kev sib xyaw thiab ntom perovskite polycrystalline zaj duab xis nrog rau saum npoo zoo ntawm tsuas yog 0.8nm.
Cov chaw loj hauv thaj chaw perovskite (6cm × 9cm) npaj los ntawm cov riam txheej txheej qauv ua kom pom kev sib txawv zoo heev ntawm cov txheej txheem tuab, qhov chaw ntawm lub cev tawv tawv, cov nplaim fluorescence, thiab fluorescence lub neej. Cov EQE ntawm perovskite LED ntaus ntawv npaj los ntawm cov riam txheej txheem yog kom siab npaum li 16.1% (0.04cm2) thiab 12.7% (1cm2). Super cheeb tsam loj (28cm2) perovskite LED emits lub teeb heev tsis xws teeb liab thaum ua haujlwm.
Nyob rau tib lub sijhawm, pawg neeg tshawb fawb tseem siv cov txheej txheem kos txheej los npaj cov hluav taws xob perovskite LED raws PEN / ITO substrate, uas tau muab lub hauv paus rau kev npaj ntawm thaj chaw loj hloov optoelectronic pab kiag li lawm. Cov haujlwm saum toj no tau qhia tag nrho ua tau ntawm kev npaj thaj chaw loj, kev ua haujlwm siab ntawm cov hluav taws xob ntau ntawm cov hluav taws xob LED los ntawm tus txheej txheem squeegee thiab qhov kev cia siab zoo ntawm kev siv nws mus rau kev lag luam LED teeb pom kev zoo.
Xib fwb Xiao Zhengguo los ntawm Chav Haujlwm Physics, University of Science thiab Technology ntawm Tuam Tshoj yog tus sau cov ntawv sau. Cov tub ntxhais kawm kws tshaj lij Chu Shenglong thiab Chen Wenjing ntawm Lub Tsev Haujlwm Physics, thiab tus tub ntxhais kawm tus kws tshaj lij Fang Zhibin yog thawj tus kws sau ntawv ntawm cov ntawv. Cov kev tshawb fawb no tau pab nyiaj los ntawm National Natural Science Foundation ntawm Tuam Tshoj, Lub Tsev Haujlwm Saib Xyuas Haujlwm ntawm Lub Tsev Haujlwm Saib Xyuas Kev Nruab Nrab ntawm Tuam Tshoj, thiab University of Science thiab Technology ntawm Tuam Tshoj. (Tau qhov twg los: Tuam Tshoj University of Science thiab Technology Xov Xwm Network)
