Ngokuphuhliswa komboniso we-LED, ngakumbi nangakumbi itekhnoloji kunye nokusetyenziswa komboniso we-LED kuye kwafunyanwa.
Apha ndifuna ukuthetha ngobuchwephesha obutsha beUmboniso we-LED.Sinokufunda iindlela zokubonisa i-LED kobu buchwepheshe butsha.Oku kuya kusinceda senze izigqibo ezingcono.
Impumelelo enkulu yenziwe kwinkalo yophando lwe-OLED olumxinwa
Ngo-Oktobha 14, i-Nature Photonics yapapasha kwi-intanethi impumelelo yamva nje yeqela likaNjingalwazi uYang Chuluo weYunivesithi yaseShenzhen kwinkalo yophando lwe-OLED.
Izixhobo ze-Thermally Activated Delayed Fluorescence (TADF) ziye zaba yindawo yophando kwi-organic light-emitting diode (OLED) imathiriyeli ekhupha ukukhanya kule minyaka ilishumi idlulileyo ngenxa yokukwazi kwabo ukufikelela kwithiyori eyi-100% yobuchule bobungakanani bangaphakathi.Kwiminyaka yakutshanje, izixhobo ezininzi ze-resonance thermally activated fluorescence (MR-TADF) zinamandla amakhulu okusebenza kwimiboniso yenkcazo ephezulu ngenxa yeempawu zokukhutshwa kwebhendi emxinwa.
Nangona kunjalo, ireverse intersystem jumping rate (kRISC) yeresonance multiple TADF imathiriyeli iyacotha, nto leyo ekhokelela ekucuthekeni kabukhali kokusebenza kwezixhobo ezikhupha ukukhanya ekukhanyeni okuphezulu, nto leyo eyenza kube nzima kwizixhobo ze-OLED ezihambelanayo ukuba zibe nokusebenza okuphezulu. kunye nokucoceka kombala ophezulu.kunye nokuqengqeleka okuphantsi.Ukuze kusonjululwe ingxaki ephambili yokuqengqeleka kobuchule, iqela likaNjingalwazi uYang Chuluo weYunivesithi yaseShenzhen lenze i-BNSeSe ngokushumeka into engeyiyo eyentsimbi enzima ye-athomu ye-athomu ye-selenium kwisakhelo sokuphinda-phinda, kwaye lasebenzisa isiphumo esinzima se-athomu ukuqinisa ukudibanisa. phakathi kwe-single kunye ne-triplet (i-S1 kunye ne-T1) ye-orbitals yezinto., okukhokelela kwi-kRISC ephezulu kakhulu (2.0 ×I-106 s-1) kunye ne-photoluminescence quantum esebenzayo (100%).
Ukusebenza komyinge wangaphandle wesixhobo se-OLED esifakwe ngumphunga esilungiswe ngokusebenzisa i-BNSeSe njengempahla yeendwendwe yomaleko okhupha ukukhanya iphakame kangange-36.8%, kwaye ukusebenza kwayo kakuhle kucinezelwe.Ukusebenza komyinge wangaphandle kusephezulu ukuya kuthi ga kwi-21.9% kukukhanya kwe-m², okuthelekiseka nezinto zephosphorescent ezifana ne-iridium kunye neplatinam.Ukongeza, okwesihlandlo sokuqala, benza izixhobo ze-OLED ze-superfluorescent besebenzisa izixhobo ezininzi ze-TADF zohlobo lwe-resonance njengezinzwa.Izixhobo ze-LED ezicacileyo.Isixhobo sinobona bungakanani bangaphandle bokusebenza kakuhle kwe-40.5% kunye nokuphumelela komyinge wangaphandle we-32.4% kukukhanya kwe-1000 cd m².Nakukukhanya kwe-10,000 cd m-², ukusebenza komyinge wangaphandle kusephezulu ukuya kutsho kwi-23.3%, obona bukhulu bamandla bokusebenza bungaphezulu kwe-200 lm W-1, kwaye ukukhanya okungaphezulu kusondele kwi-200,000 cd m-².
Lo msebenzi unikeza ingcamango entsha kunye nendlela esebenzayo yokusombulula ingxaki yokuphumelela kwe-MR-TADF yezixhobo ze-electroluminescent, ezinamathuba amahle okusebenza kwi-high-definition display.Iziphumo ezinxulumene nazo zapapashwa kwijenali eyaziwayo kumazwe ngamazwe i-Nature Photonics phantsi kwesihloko esithi "Efficient selenium-integrated TADF OLEDs kunye nokuncipha kwe-roll-off" ("Nature Photonics", factor factor 39.728, JCR District 1 of the Chinese Academy of Sciences, ranking okokuqala kwintsimi ye-optics).
I-USTC yenze inkqubela phambili ebalulekileyo kwintsimi ye-perovskite LED kunye nophando lwesixhobo esikhanyayo
Izinto ze-Perovskite zineemfuno ezibalulekileyo zokusetyenziswa kwimimandla yeeseli zelanga, ii-LED, kunye ne-photodetectors ngenxa yeempawu zabo ezintle ze-optoelectronic.Umgangatho wokwenziwa kwefilimu kunye ne-microstructure yeefilimu ze-perovskite zidlala indima ebalulekileyo ekusebenzeni kwezixhobo ze-optoelectronic.I-nanostructure eyenziwe phezu kwendawo ye-perovskite yandisa ukusabalalisa kweefotoni kwifilimu encinci, ukuphumeza ukuphumelela kumda wokusebenza kakuhle kwezixhobo ze-LED ze-perovskite.Iziphumo ezihambelanayo zapapashwa kwiiMathiriyeli eziPhambili phantsi kwesihloko esithi "Ukoyisa uMda wokuPhumayo we-Perovskite Light-emitting Diodes kunye ne-Artificially Formed Nanostructures".
Ii-LED ze-Perovskite zineenzuzo ze-wavelength yokukhutshwa kwe-turable, ukukhutshwa okuncinci kwesiqingatha se-peak ububanzi, kunye nokulungiselela okulula.Ukusebenza kwesixhobo se-perovskite LEDs okwangoku kukhawulelwe ngokusebenza kokukhanya kokukhanya.Ke ngoko, ukwandisa ukusebenza kakuhle kokutsalwa kokukhanya kwesixhobo sisikhokelo sophando esibaluleke kakhulu.Kwiii-LED eziphilayo kunye ne-quantum dot LEDs, iileyile ezongezelelweyo zokukhupha ukukhanya ngokuqhelekileyo ziyafuneka ukwandisa i-photon extraction, njengokusetyenziswa kwe-fly-eye lens arrays, i-biomimetic moth-eye nanostructures, kunye ne-low-refractive-index coupling layers.Nangona kunjalo, ezi ndlela zenza inkqubo yokwenziwa kwesixhobo ibe nzima ngakumbi kwaye inyuse iindleko zokwenziwa.
Iqela lophando likaXiao Zhengguo lichaze indlela enokuthi yenze ngokuzenzekelayo isakhelo esibhalwe kumphezulu weefilimu ezincinci zeperovskite,kunye nokuphucula ukutsalwa kokukhanyaukusebenza kakuhle kwe-perovskite
I-LEDs ngokunyusa i-photon isasaza phezu kwefilimu encinci.Ngethuba lokulungiswa kwefilimu, ngokulawula ixesha lokuhlala le-anti-solvent kwindawo yefilimu, inkqubo ye-crystallization ye-perovskite inokulawulwa, okubangela ukuba kubekho i-textured surface.Kwiifilimu ezinobunzima obuphakathi kwe-1.5 μm, uburhabaxa bomphezulu bunokulawulwa ngokuqhubekayo ukusuka kwi-15.3 nm ukuya kwi-241 nm, kwaye inkungu inyuka ngokuhambelanayo ukusuka kwi-6% ukuya ngaphezulu kwe-90%.
Ukuzuza ekwandeni kwefoton esasazwa kumhlaba wefilimu, ukukhanya kokukhutshwa kwe-perovskite LEDs kunye nezakhiwo ezenziweyo kunyuke ukusuka kwi-11.7% ukuya kwi-26.5% yee-LED ze-perovskite ezicwangcisiweyo, kunye nokusebenza kwesixhobo esihambelanayo.perovskite LEDsnayo inyuke ukusuka kwi-10%.I-% inyuke kakhulu yaya kutsho kuma-20.5%.Umsebenzi ongentla ubonelela ngendlela entsha yokwenza i-nanostructures ekhupha ukukhanya kwizixhobo ze-perovskite optoelectronic.Ifilimu ye-perovskite ene-micro-nano structure ifana ne-textured morphology kwi-crystalline silicon iiseli zelanga zelanga, okulindeleke ukuba ziphucule ukukhanya kokukhanya kunye nokusebenza kweeseli zelanga ze-perovskite.
Ixesha lokuposa: Nov-07-2022