Kwanan baya, tawagar binciken Farfesa Xiao Zhengguo daga makarantar koyon ilmin lissafi ta jami'ar kimiyya da fasaha ta kasar Sin, da mahimmin dakin gwaje-gwaje na kimiyyar lissafi mai karfi hade da juna na kwalejin kimiyyar kasar Sin, da cibiyar bincike ta kasa ta Hefei ta kimiyyar kere-kere ta kasa da kasa sun ba da muhimmanci. ci gaba a fagen shirya ingantaccen kuma barga perovskite guda crystalLEDs.

Ƙungiyar binciken ta haɓaka babban inganci, babban yanki da matsananci-bakin perovskite guda lu'ulu'u ta amfani da hanyar hana sararin samaniya, da kuma shirya perovskite guda crystal LED tare da haske fiye da 86000 cd/m2 da rayuwa har zuwa 12500 h don karo na farko, wanda ya dauki wani muhimmin mataki zuwa aikace-aikace na perovskite LED ga mutumhaskakawa. Nasarorin da suka dace, mai taken "Maɗaukaki mai haske da kwanciyar hankali guda-crystal perovskite haske-emitting diodes", an buga su a cikin Nature Photonics a ranar 27 ga Fabrairu.

Metal halide perovskite ya zama sabon ƙarni na nunin LED da kayan walƙiya saboda tsayinsa mai iya daidaitawa, kunkuntar rabin girman nisa da shirye-shiryen ƙarancin zafin jiki. A halin yanzu, ƙimar ƙimar ƙimar waje (EQE) na perovskite LED (PeLED) dangane da fim ɗin bakin ciki na polycrystalline ya wuce 20%, kwatankwacin LED Organic LED (OLED). A cikin 'yan shekarun nan, rayuwar sabis na mafi yawan rahoton high-inganci perovskiteLED na'urorinkewayo daga ɗaruruwan zuwa dubban sa'o'i, har yanzu suna bayan OLEDs. Ƙarfafawar na'urar za ta shafi abubuwa kamar motsi na ion, dasa shuki marasa daidaituwa da zafi joule da aka haifar yayin aiki. Bugu da ƙari, haɓakar Auger mai tsanani a cikin na'urorin polycrystalline perovskite kuma yana iyakance hasken na'urorin.

Dangane da matsalolin da ke sama, ƙungiyar bincike ta Xiao Zhengguo ta yi amfani da hanyar hana sararin samaniya don shuka lu'ulu'u ɗaya na perovskite akan ma'aunin da ke wurin. Ta hanyar daidaita yanayin girma, gabatar da amines na kwayoyin halitta da polymers, an inganta ingancin crystal yadda ya kamata, don haka shirya babban ingancin MA0.8FA0.2PbBr3 lu'ulu'u na bakin ciki guda ɗaya tare da ƙaramin kauri na 1.5 μ m. Ƙunƙarar saman ƙasa bai wuce 0.6 nm ba, kuma yawan amfanin ƙasa mai walƙiya na ciki (PLQYINT) ya kai 90%. The perovskite guda crystal LED na'urar shirya tare da bakin ciki guda crystal kamar yadda haske emitting Layer yana da EQE na 11.2%, haske fiye da 86000 cd/m2, da kuma tsawon rayuwa na 12500 h. Da farko ya isa bakin kofa na kasuwanci, kuma ya zama ɗaya daga cikin na'urorin LED masu kwanciyar hankali na perovskite a halin yanzu.

Ayyukan da ke sama sun nuna cikakken cewa ta yin amfani da perovskite guda kristal na bakin ciki kamar yadda hasken ke fitarwa shine mafita mai yuwuwa ga matsalar kwanciyar hankali, kuma perovskite guda kristal LED yana da kyakkyawan fata a fagen hasken ɗan adam da nuni.