Ndi chitukuko cha chiwonetsero cha LED, matekinoloje ochulukirachulukira komanso kugwiritsa ntchito mawonekedwe a LED apezeka.
Apa ndikufuna kulankhula zaukadaulo watsopano waChiwonetsero cha LED.Titha kuphunzira momwe mawonedwe a LED amayendera kuchokera ku matekinoloje atsopanowa.Izi zidzatithandiza kupanga zosankha zabwino.
Kupambana kwakukulu kwachitika pankhani ya kafukufuku wocheperako wa OLED
Pa Okutobala 14, Nature Photonics idasindikiza pa intaneti zomwe gulu la Pulofesa Yang Chuluo waku Shenzhen University lachita pa kafukufuku wa OLED pa intaneti.
Zipangizo za Thermally Activated Delayed Fluorescence (TADF) zakhala malo opangira kafukufuku muzinthu zotulutsa kuwala kwa organic light-emitting diode (OLED) m'zaka khumi zapitazi chifukwa cha kuthekera kwawo kuchita bwino kwambiri mkati mwa 100%.M'zaka zaposachedwa, zida zingapo za resonance thermally activated delayed fluorescence (MR-TADF) zili ndi kuthekera kwakukulu kogwiritsa ntchito pamawonekedwe apamwamba kwambiri chifukwa cha mawonekedwe awo amtundu wopapatiza.
Komabe, reverse intersystem jumping rate (kRISC) ya multiple resonance TADF materials nthawi zambiri imakhala yochedwa, zomwe zimapangitsa kuti zipangizo zotulutsa kuwala zikhale zowala kwambiri, zomwe zimapangitsa kuti zikhale zovuta kuti zipangizo zofanana za OLED zizigwira ntchito bwino. ndi chiyero chamtundu wapamwamba.ndi kutsika pang'ono.Kuti athetse vuto lalikulu la kutulutsa kwachangu, gulu la Pulofesa Yang Chuluo wa ku Shenzhen University adapanga BNSeSe pophatikizira chinthu chopanda chitsulo cholemera cha atomu selenium mumitundu ingapo, ndipo adagwiritsa ntchito mphamvu ya atomu yolemetsa kuti apititse patsogolo kulumikizana. pakati pa ma orbitals amodzi ndi atatu (S1 ndi T1) azinthuzo., zomwe zimapangitsa kRISC yokwera kwambiri (2.0 ×106 s-1) ndi mphamvu ya photoluminescence quantum (100%).
Kugwira ntchito kwakunja kwa chipangizo cha OLED choyikidwa ndi nthunzi chokonzedwa pogwiritsa ntchito BNSeSe monga zida za alendo zomwe zimayatsidwa ndi kuwala zimafika pa 36.8%, ndipo kutulutsa kwake kumaponderezedwa bwino.Kuwala kwakunja kwakunja kukadali kokwera mpaka 21.9% pakuwala kwa m-², komwe kungafanane ndi zida za phosphorescent monga iridium ndi platinamu.Kuphatikiza apo, kwa nthawi yoyamba, adapanga zida za OLED zapamwamba kwambiri pogwiritsa ntchito zida za TADF zamtundu wa resonance ngati zodziwikiratu.Zida zowonekera za LED.Chipangizochi chimakhala ndi mphamvu zambiri zakunja za 40.5% komanso mphamvu yakunja ya 32.4% pakuwala kwa 1000 cd m².Ngakhale pakuwala kwa 10,000 cd m-², mphamvu yakunja yakunja ikadali yokwera mpaka 23.3%, mphamvu zochulukirapo zimaposa 200 lm W-1, ndipo kuwala kokwanira kumayandikira 200,000 cd m-².
Ntchitoyi imapereka lingaliro latsopano komanso njira yothandiza yothetsera vuto loyendetsa bwino la zida za MR-TADF electroluminescent, zomwe zimakhala ndi chiyembekezo chogwiritsa ntchito pamawonekedwe apamwamba kwambiri.Zotsatira zofananirazi zidasindikizidwa m'magazini odziwika padziko lonse lapansi Nature Photonics pansi pamutu wakuti "Efficient selenium-integrated TADF OLEDs with reduce roll-off" ("Nature Photonics", impact factor 39.728, JCR District 1 of the Chinese Academy of Sciences, kusanja choyamba m'munda wa Optics).
USTC yapita patsogolo kwambiri pankhani ya perovskite LED ndi kafukufuku wa zida zotulutsa kuwala
Zida za Perovskite zili ndi chiyembekezo chofunikira chogwiritsa ntchito m'maselo a dzuwa, ma LED, ndi ma photodetectors chifukwa cha mawonekedwe awo abwino kwambiri a optoelectronic.Kapangidwe ka filimuyo ndi mawonekedwe ang'onoang'ono a mafilimu a perovskite amatenga gawo lofunikira pakuchita kwa zida za optoelectronic.Nanostructure yomwe imapangidwa pamwamba pa perovskite imawonjezera kubalalika kwa ma photon pamwamba pa filimu yopyapyala, ndikukwaniritsa bwino malire a perovskite LED zipangizo.Zotsatira zofananira zidasindikizidwa mu Advanced Materials pansi pa mutu wakuti "Kugonjetsa Malire Opambana a Perovskite Light-emitting Diodes ndi Nanostructures Artificially Formed".
Ma LED a Perovskite ali ndi maubwino a kutalika kwa mawonekedwe osinthika, kutulutsa kocheperako theka lapamwamba, komanso kukonzekera kosavuta.Kugwiritsa ntchito bwino kwa ma LED a perovskite pakali pano kumachepetsedwa kwambiri ndi kuwala kotulutsa kuwala.Chifukwa chake, kukulitsa mphamvu yotulutsa kuwala kwa chipangizocho ndikofunikira kwambiri pakufufuza.Muma organic LED ndi ma quantum dot ma LED, zigawo zowonjezera zotulutsa kuwala zimafunikira kuti muwonjezere kutulutsa kwa ma photon, monga kugwiritsa ntchito ma lens a fly-eye, biomimetic moth-eye nanostructures, ndi zigawo zochepa za refractive-index coupling.Komabe, njirazi zimapangitsa kuti njira yopangira chipangizocho ikhale yovuta kwambiri ndikuwonjezera mtengo wopangira.
Gulu lofufuza la Xiao Zhengguo lidanenanso njira yomwe imatha kupanga zokha mawonekedwe owoneka bwino pamakanema owonda a perovskite,ndi kusintha kuwala m'zigawoluso la perovskite
Ma LED powonjezera kufalikira kwa photon pamwamba pa filimu yopyapyala.Panthawi yokonzekera filimuyo, poyang'anira nthawi yokhalamo ya anti-solvent pamtunda wa filimuyo, njira ya crystallization ya perovskite ikhoza kuyendetsedwa, zomwe zimapangitsa kuti pakhale mawonekedwe.Kwa mafilimu omwe ali ndi makulidwe apakati a 1.5 μm, kuuma kwapamwamba kumatha kuwongoleredwa mosalekeza kuchokera pa 15.3 nm mpaka 241 nm, ndipo chifungacho chimawonjezeka kuchokera 6% mpaka 90%.
Kupindula ndi kuwonjezeka kwa photon kubalalika padziko filimu, kuwala m'zigawo Mwachangu wa perovskite LEDs ndi mapangidwe textured chinawonjezeka kuchokera 11.7% mpaka 26.5% ya planar perovskite LEDs, ndi lolingana chipangizo dzuwa laperovskite LEDyawonjezekanso kuchoka pa 10%.% idakwera kwambiri mpaka 20.5%.Ntchito yomwe ili pamwambayi imapereka njira yatsopano yopangira ma nanostructures otulutsa kuwala kwa perovskite optoelectronic zipangizo.Kanema wa perovskite wokhala ndi mawonekedwe ang'onoang'ono-nano akufanana ndi mawonekedwe opangidwa ndi ma crystalline silicon solar cell, omwe akuyembekezeka kupititsa patsogolo kuyamwa bwino komanso magwiridwe antchito a ma cell a solar a perovskite.
Nthawi yotumiza: Nov-07-2022