Perovskite light-emitting diode (perovskite LED) ndi mbadwo watsopano wa teknoloji yotulutsa kuwala yomwe ili ndi kuthekera kwakukulu kowonetsera, kuyatsa, kulankhulana ndi zina.Ma LED a Perovskite ali ndi ndalama zochepa zopangira komanso ubwino waukulu waukadaulo: ali ndi mawonekedwe a kupepuka, kuonda komanso kusinthasintha kofanana ndi ma OLED, komanso amakhala ndi chiyero chofananira chamtundu komanso kuwoneka bwino kwa ma LED a III-V semiconductor.Pambuyo pazaka zingapo za chitukuko, mphamvu ya perovskiteMa LEDn'zofanana ndi luso lamakono lotulutsa kuwala.
Perovskite LED chipangizo kapangidwe (pamwamba kumanzere);
Chemical formula ya bipolar molecular stabilizer SFB10 (pansi kumanzere)
Ubale pakati pa chipangizo T50 moyo wonse ndi kuwala (graph kumanja)
Komabe, mofanana ndi maselo a dzuwa a perovskite, kusakhazikika kwa ma LED a perovskite ndizovuta kwambiri pozindikira ntchito za mafakitale.Pakalipano, moyo wa ma LED apamwamba a perovskite nthawi zambiri amakhala ndi maola 10-100.Kutalika kwa moyo wofunikira kuti ukadaulo wa OLED ulowe m'mafakitale ndi osachepera maola 10,000.Pali zovuta zazikulu kumbali iyi chifukwa ma semiconductors a perovskite amatha kukhala osakhazikika.Ndi zabwino kwaChiwonetsero cha LED.Maonekedwe ake a kristalo ali ndi ma ionic ofunika kwambiri, ndipo ma ions amasuntha mosavuta pansi pa gawo lamagetsi la LED, zomwe zimapangitsa kuti zinthuzo ziwonongeke.
Posachedwapa, gulu la Pulofesa David Di ndi wofufuza Zhao Baodan wochokera ku State Key Laboratory of Modern Optical Instruments, School of Optoelectronics, Zhejiang University ndi
International Research Center of Advanced Photonics, Haining International Campus, apanga bwino kwambiri mbali iyi.Pogwiritsa ntchito bipolar molecular stabilizer, adapeza nthawi yayitali kwambiri yogwiritsira ntchito ma LED a perovskite omwe amakwaniritsa zofunikira pakugwiritsa ntchito.
"Ma LED a perovskite awa adayendetsedwa ndi 5 mA / c㎡ nthawi zonse kwa miyezi 5 yotsatizana (maola 3600) popanda kuwala kowala," adatero David Dee.Kuwona kwa LED.ZaP1.56Chiwonetsero cha LED.Zida zimenezi n’zokhazikika, ndipo zoyezetsa zina zomwe zikuchitikabe zikuoneka kuti n’zovuta kumaliza pakatha chaka chimodzi kapena kuposerapo.Kuti mupeze chidziwitso cha moyo wonse mkati mwa nthawi yoyeserera, kuyesa kofulumira kwa ukalamba kwa LED kuyenera kuchitika. ”
Ma LED a perovskite apafupi ndi infrared awa amawonetsa nthawi yayitali yogwira ntchito.Mwachitsanzo, ndi kuwala koyambirira kwa 2.1 W sr-1 m-2 (panopa ndi 3.2 mA/c㎡), chipangizo choyerekezeredwa cha T50 moyo wonse (nthawi yomwe imatengera kuti kuwala koyambirira kuchepe kufika pa 50%) ndi maola 32675 ( 3.7 zaka).Mphamvu ya kuwala yomwe imaperekedwa ndi kuwala kumeneku ikufanana ndi OLED yobiriwira yamalonda yomwe ikugwira ntchito pakuwala kwambiri kwa 1000 cd/m2.Pakuwunika kotsika kwa 0.21 W sr-1 m-2 (1/10 ya kuwala pamwambapa) kapena 0.7 mAc㎡, nthawi ya moyo wa T50 ikuyembekezeka kukhala maola 2.4 miliyoni (pafupifupi zaka 270).
"Tikukhulupirira kuti m'pofunika kusanthula moyo wodalirika wa LED yatsopanoyi, yomwe tidasonkhanitsa mfundo 62 zamoyo zonse za chipangizocho poyesera kukalamba mwachangu, zomwe zikuwonetsa kuchuluka kwamakono kwa 10-200 mA/c㎡."Guo Bingbing adatero.The electroluminescence kunja kwachulukidwe mphamvu (EQE) ndi mphamvu kutembenuka mphamvu (ECE) chipangizo anafika 22.8% ndi 20.7%, motero, amene ali opambana kwambiri pafupifupi infrared perovskite LEDs.
Olembawo adapeza kuti zida za luminescent za perovskite zili ndi zida za kristalo zokhazikika."Mapangidwe a kristalo a zinthuzo sanasinthe pambuyo pa masiku oposa 322," adatero Zhao Baodan.
Kugwira ntchito kwanthawi yayitali komanso kufulumizitsa kukalamba kwa ma LED a perovskite (chithunzi chakumanzere);
Zambiri zakunja za kuchuluka kwa zida zowongolera ndi zida zokhazikika (gawo lakumanja)
"Izi zikuwonetsa kuti bipolar molecular stabilizer imathandiza perovskite kusunga gawo lake loyambirira la kristalo ndi zinthu zabwino kwambiri za optoelectronic. Mapangidwe a kristalo a zitsanzo za perovskite zowongolera anasintha kwambiri ndikuwonongeka mkati mwa milungu iwiri. "
Kusamuka kwa ion mu perovskites ndi chimodzi mwazinthu zofunika zomwe zimapangitsa kusakhazikika, ndipo vutoli limakhala lalikulu kwambiri chifukwa cha mphamvu zamagetsi zomwe zimagwiritsidwa ntchito mu ma LED ndi ma LED.Chiwonetsero cha Mini LED."Zoyesera zathu ndi kuwerengera kwathu zimasonyeza kuti mamolekyu a bipolar amapanga mgwirizano wa mankhwala kapena kugwirizana ndi ions pa malire a tirigu wa perovskite," adatero Guo Bingbing, "zomwe zingakhale chifukwa chake kusamuka kwa ion kumakhala kovuta mu perovskites yathu. ndi othandizira athu awonetsa kuponderezedwa kwa zochitika za ion, "anawonjezera Zhao Baodan.
Zotsatira za moyo wa chipangizo zimasonyeza kuti zipangizo za perovskite zilibe "zowonongeka zachibadwa" pokhudzana ndi kukhazikika."Ma semiconductors atsopano, monga zitsulo za halide perovskites, amaonedwa kuti ndi osakhazikika, makamaka pamagetsi apamwamba kwambiri, monga magetsi a LED," anatero David Dee."Zotsatira zathu zikuwonetsa kuti kukwaniritsa zida zokhazikika za perovskite si 'ntchito yosatheka'".
Nthawi yayitali ya chipangizocho ikuyembekezeka kukulitsa chidaliro pamunda wa perovskite wa LED, popeza wakwaniritsa zofunikira pakukhazikika kwa ma OLED amalonda.Ma LED omwe ali pafupi ndi infraredwa amatha kugwiritsidwa ntchito pazinthu monga zowonetsera pafupi ndi infrared, kulumikizana, ndi biology.Ngakhale zida zowoneka bwino za perovskite zokhala ndi moyo wautali zofananira zikuyenera kupangidwa, kukwaniritsidwa kwa ma ultra-stable perovskite LEDs kumatsegula njira yaukadaulo wa perovskite luminescence kulowa m'mafakitale.
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Kuwona kwa ion kusamuka kwa perovskite pansi pamunda wamagetsi ndi kuyesa kwa microfluorescence imaging
Nthawi yotumiza: Aug-24-2022