Nrog rau txoj kev loj hlob ntawm LED zaub, ntau thiab ntau technologies thiab daim ntawv thov ntawm LED zaub tau pom.
Ntawm no kuv xav tham ib co tshiab technologies ntawmLED zaub.Peb tuaj yeem kawm cov qauv ntawm LED zaub los ntawm cov thev naus laus zis tshiab no.Qhov no yuav pab peb txiav txim siab zoo dua.
Ib qho kev tawg loj tau ua nyob rau hauv kev tshawb fawb nqaim-spectrum OLED
Thaum Lub Kaum Hli 14, Nature Photonics luam tawm online qhov kev ua tiav tshiab kawg ntawm pab pawg ntawm xibfwb Yang Chuluo ntawm Shenzhen University hauv kev tshawb fawb OLED.
Thermally Activated Delayed Fluorescence (TADF) cov ntaub ntawv tau dhau los ua qhov kev tshawb fawb hotspot nyob rau hauv cov organic teeb-emitting diode (OLED) lub teeb-emitting cov ntaub ntawv nyob rau hauv lub xyoo caum dhau los vim lawv muaj peev xwm mus cuag ib tug theoretical 100% internal quantum efficiency.Nyob rau hauv xyoo tas los no, ntau yam resonance thermally activated qeeb fluorescence (MR-TADF) cov ntaub ntawv muaj peev xwm siv tau zoo hauv cov lus qhia siab vim lawv qhov nqaim-band emission yam ntxwv.
Txawm li cas los xij, qhov rov qab intersystem dhia tus nqi (kRISC) ntawm ntau cov khoom siv resonance TADF feem ntau qeeb, ua rau muaj kev cuam tshuam ntawm kev ua haujlwm ntawm lub teeb-emitting li ntawm qhov ci ci, uas ua rau nws nyuaj rau cov khoom siv OLED sib xws kom muaj kev ua haujlwm siab. thiab siab xim purity.thiab qis qis-tawm.Txhawm rau daws qhov teeb meem tseem ceeb ntawm kev ua tau zoo yob-tawm, pab pawg ntawm xibfwb Yang Chuluo ntawm Shenzhen University tau tsim BNSeSe los ntawm embedding non-metallic hnyav atom selenium caij rau hauv ntau lub hauv paus resonance, thiab siv cov nyhuv atom hnyav los txhim kho qhov sib txuas. nruab nrab ntawm ib leeg thiab triplet (S1 thiab T1) orbitals ntawm cov khoom., ua rau siab heev kRISC (2.0 ×106 s-1) thiab photoluminescence quantum efficiency (100%).
Lub quantum efficiency sab nraud ntawm vapor-deposited OLED ntaus ntawv npaj los ntawm kev siv BNSeSe raws li cov qhua cov khoom ntawm lub teeb-emitting txheej yog siab li 36.8%, thiab nws efficiency yob-tawm yog zoo suppressed.Lub quantum efficiency sab nraud tseem yog siab li 21.9% ntawm m-² brightness, uas yog piv rau phosphorescent cov ntaub ntawv xws li iridium thiab platinum.Tsis tas li ntawd, thawj zaug, lawv tau tsim cov khoom siv superfluorescent OLED siv ntau hom resonance-type TADF cov ntaub ntawv raws li sensitizers.Cov khoom siv pob tshab LED.Cov cuab yeej muaj qhov siab tshaj plaws sab nraud quantum efficiency ntawm 40.5% thiab lwm yam quantum efficiency ntawm 32.4% ntawm 1000 cd m-² brightness.Txawm nyob rau ntawm 10,000 cd m-² brightness, lub sab nraud quantum efficiency tseem yog siab li 23.3%, lub siab tshaj plaws zog efficiency tshaj 200 lm W-1, thiab lub siab tshaj plaws brightness yog ze rau 200,000 cd m-².
Qhov kev ua haujlwm no muab lub tswv yim tshiab thiab txoj hauv kev zoo los daws cov teeb meem kev ua haujlwm ntawm MR-TADF electroluminescent cov cuab yeej, uas muaj cov ntawv thov kev cia siab zoo hauv cov lus qhia siab.Cov txiaj ntsig cuam tshuam tau luam tawm nyob rau hauv cov ntawv xov xwm nrov thoob ntiaj teb Nature Photonics nyob rau hauv lub npe ntawm "Efficient selenium-integrated TADF OLEDs nrog txo roll-off" ("Nature Photonics", feem cuam tshuam 39.728, JCR District 1 ntawm Suav Academy ntawm Sciences, qeb duas thawj zaug hauv thaj teb ntawm optics).
USTC tau ua tiav qhov tseem ceeb hauv kev tshawb fawb ntawm perovskite LED thiab lub teeb-emitting ntaus ntawv tshawb fawb
Cov ntaub ntawv Perovskite muaj cov ntawv thov tseem ceeb hauv thaj chaw ntawm lub hnub ci, LEDs, thiab photodetectors vim lawv cov khoom zoo heev optoelectronic.Cov zaj duab xis tsim zoo thiab microstructure ntawm perovskite films ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm ntawm optoelectronic li.Lub nanostructure tsim nyob rau saum npoo ntawm perovskite tsub kom lub tawg ntawm photons nyob rau saum npoo ntawm nyias zaj duab xis, ua tiav ib tug breakthrough nyob rau hauv lub efficiency txwv ntawm perovskite LED li.Cov txiaj ntsig cuam tshuam tau luam tawm nyob rau hauv Cov Khoom Siv Zoo Tshaj Plaws hauv qab lub npe "Tshaj tawm qhov kev txwv ntawm Perovskite Light-emitting Diodes nrog Artificially Tsim Nanostructures".
Perovskite LEDs muaj qhov zoo ntawm tunable emission wavelength, nqaim emission ib nrab-peak dav, thiab yooj yim npaj.Cov cuab yeej ua haujlwm ntawm perovskite LEDs yog tam sim no tsuas yog txwv los ntawm lub teeb rho tawm efficiency.Yog li ntawd, ua kom lub teeb extraction efficiency ntawm lub cuab yeej yog ib tug tseem ceeb heev kev tshawb fawb kev taw qhia.Hauvorganic LEDs thiab quantum dot LEDs, ntxiv lub teeb rho tawm txheej feem ntau yuav tsum tau nce photon extraction, xws li kev siv cov ya-qhov muag lens arrays, biomimetic npauj-qhov muag nanostructures, thiab low-refractive-index coupling txheej.Txawm li cas los xij, cov txheej txheem no ua rau cov txheej txheem tsim cov cuab yeej nyuaj thiab ua rau tus nqi tsim khoom.
Xiao Zhengguo cov kev tshawb fawb pab pawg tau tshaj tawm ib txoj hauv kev uas tuaj yeem tsim cov qauv zoo nkauj ntawm lub ntsej muag ntawm perovskite nyias zaj duab xis,thiab txhim kho lub teeb rho tawmefficiency ntawm perovskite
LEDs los ntawm kev ua kom cov photon tawg nyob rau saum npoo ntawm cov zaj duab xis nyias.Thaum lub sij hawm npaj zaj duab xis, los ntawm kev tswj lub sij hawm nyob rau hauv lub anti-solvent ntawm zaj duab xis nto, lub crystallization txheej txheem ntawm perovskite yuav tswj tau, uas ua rau ib tug textured nto.Rau cov yeeb yaj kiab nrog qhov nruab nrab tuab ntawm 1.5 μm, qhov roughness ntawm qhov chaw tuaj yeem tswj tau los ntawm 15.3 nm mus rau 241 nm, thiab qhov kub hnyiab tau sib npaug los ntawm 6% mus rau ntau dua 90%.
Tau txais txiaj ntsig los ntawm kev nce hauv photon tawg rau ntawm zaj duab xis saum npoo, lub teeb tshem tawm kev ua haujlwm ntawm perovskite LEDs nrog cov qauv kev ntxhib los mos tau nce los ntawm 11.7% mus rau 26.5% ntawm planar perovskite LEDs, thiab cov cuab yeej siv tau zoo ntawmperovskite LEDskuj nce los ntawm 10%.% nce ntxiv mus rau 20.5%.Cov haujlwm saum toj no muab ib txoj hauv kev tshiab los tsim lub teeb-extracting nanostructures rau perovskite optoelectronic li.Perovskite zaj duab xis nrog micro-nano qauv zoo ib yam li textured morphology nyob rau hauv crystalline silicon solar cells, uas yuav tsum tau txhim kho lub teeb nqus efficiency thiab kev ua tau zoo ntawm perovskite hnub ci hlwb.
Post lub sij hawm: Nov-07-2022