Kafukufuku watsopano wa gulu la Wuhan University: Kugwiritsa ntchito bwino kwa LED yofiira ya Mini LED kwawonjezeka ndi 30%

Posachedwapa, gulu la Zhou Shengjun ku Wuhan University linapanga njira yatsopano yotetezera mphamvu yamagetsi ya Schottky-contact (SCBL), yomwe ingathandize kufalitsa mphamvu yamagetsi m'dera lomwe likugwira ntchito. Ndipo ingathandizenso kuti AlGaInP red igwire bwino ntchito. Kachipangizo kakang'ono ka LED(LEE).

Chithunzi chomwe chili pamwambapa chikuwonetsa (a) kapangidwe ka chipangizocho, ndi (b) njira yopangira kutengera kapangidwe ka kuwala kofiira ka AlGaInP Mini LED ndi SCBL. (c) SCBL ndi (d) Kapangidwe kofiira kochokera ku AlGaInP koyimamaikulosikopuzithunzi.

Mtsogoleri wa kafukufuku Shengjun Zhou anati gululo linagwiritsa ntchito zinthu za Schottky zomwe zimagwirizana ndi indium tin oxide (ITO) ndi p-GaP, komanso zinthu za ohmic zomwe zimagwirizana ndi ITO ndi p-GaP+ popanga SCBL, zomwe zinawonetsedwa ndi njira yosinthira kutalika.

Zhou Shengjun anati SCBL ikhoza kuchepetsa bwino kuchulukana kwa magetsi kuzungulira electrode ya p ndikulimbikitsa kufalikira kwa magetsi kofanana, motero kumawonjezera mphamvu yotulutsa kuwala ya AlGaInP red Mini LED. Chifukwa cha kufalikira kwa magetsi komanso kutulutsa kuwala, ma Mini LED okhala ndi SCBL amawonetsa kufalikira kofanana kwa kuwala, mphamvu yotulutsa kuwala kwambiri, komanso mphamvu yotulutsa kuwala kwambiri (EQE).

AlGaInP red Mini LED imagwiritsidwa ntchito kwambiri ngati gawo lofunikira la utoto wonse zowonetsera chifukwa cha kuwala kwake kwakukulu, kugwiritsa ntchito mphamvu zochepa komanso nthawi yayitali yogwira ntchito.

Komabe, kuchulukana kwa magetsi mozungulira electrode ya p kumapangitsa kuti magetsi asafalikire bwino m'dera logwira ntchito. Kuphatikiza apo, chifukwa ma photon ambiri omwe amapangidwa m'dera logwira ntchito amayamwa kapena kuwonetseredwa ndi electrode ya p yachitsulo yosawoneka bwino, mphamvu yochotsera kuwala (LEE) ya AlgainP-based Mini LED ndi yochepa.

Pofuna kuthetsa vutoli, ofufuzawo adayambitsa SCBL kuti akonze kufalikira kwa magetsi ndi kutulutsa kuwala kwa ma Mini LED ochokera ku AlgainP. Pogwiritsa ntchito kulumikizana kwa Schottky pakati pa ITO ndi P-gap, SCBL imatha kuletsa kudzaza kwa magetsi mozungulira electrode ya p. Mphamvu imakakamizidwa kulowa m'dera logwira ntchito kudzera mu P-GAP + ohmic contact layer kuti ipewe kuyamwa ndi kuwunikira kwa kuwala ndi electrode ya p yachitsulo yosawoneka bwino.

Zotsatira zake zasonyeza kuti mphamvu ya quantum efficiency (EQE) ya AlGaInP Mini LED pogwiritsa ntchito SCBL ikhoza kuwonjezeka ndi 31.8% pa mphamvu ya 20mA poyerekeza ndi AlGaInP Mini LED yopanda SCBL. Chifukwa chake, ukadaulo wa SCBL ukuyembekezeka kugwiritsidwa ntchito popanga ma LED ofiira a AlgainP omwe amagwira ntchito bwino mtsogolo.

Ndikofunikira kudziwa kuti gulu la Zhou Shengjun la ku Wuhan University latulutsanso zotsatira zatsopano za kafukufuku wa LED. Mwachitsanzo, pankhani ya ma LED a ultraviolet ozama, gululi linayambitsa Algan-based ultra-thin tunnel junction (26 nm) mu LED ya ultraviolet yozama, zomwe zinawonjezera mphamvu ya electro-optical conversion ya LED ya ultraviolet yozama ndi 5.5%.

Pankhani ya Mini LED, gululo linakweza magwiridwe antchito a ma chips a Mini LED abuluu ndi obiriwira pogwiritsa ntchito Full-angle Distributed Bragg Reflector (DBR). Pansi pa 10mA injection current, mphamvu yotulutsa ya Mini LED yabuluu ndi yobiriwira yochokera ku ITO/DBR imawonjezeka ndi pafupifupi 7.7% ndi 7.3%, motsatana.