Perovskite haske-emitting diode (perovskite LED) wani sabon ƙarni ne na fasahar samar da haske tare da babban damar nunawa, haske, sadarwa da sauran fannoni.LEDs na Perovskite suna da ƙananan farashin samarwa da fa'idodin fasaha masu mahimmanci: suna da halayen haske, bakin ciki da sassauci kamar OLEDs, kuma suna da tsabtar launi iri ɗaya da ƙarancin gani zuwa LEDs na semiconductor na III-V.Bayan kawai 'yan shekaru na ci gaba, da yadda ya dace na perovskiteLEDsyayi kwatankwacin na manyan fasahohin da ke fitar da haske.
Perovskite LED tsarin na'urar (a sama hagu);
Tsarin sinadaran bipolar molecular stabilizer SFB10 (a hagu hagu)
Dangantaka tsakanin na'urar T50 tsawon rayuwa da haske (jafin dama)
Koyaya, kama da ƙwayoyin hasken rana na perovskite, rashin kwanciyar hankali na LEDs perovskite shine babban ƙalubale don fahimtar aikace-aikacen masana'antu.A halin yanzu, tsawon rayuwar manyan LEDs perovskite yana kan tsari na sa'o'i 10-100.Tsawon rayuwar da ake buƙata don fasahar OLED don shiga masana'antu shine aƙalla sa'o'i 10,000.Akwai ƙalubale masu mahimmanci a wannan shugabanci saboda perovskite semiconductor na iya zama rashin kwanciyar hankali.Yana da kyau gaLED nuni.Tsarinsa na kristal yana da mahimman kaddarorin ionic, kuma ions suna motsawa cikin sauƙi a ƙarƙashin filin lantarki da ake amfani da su na LED, yana haifar da ƙasƙanci.
Kwanan nan, tawagar Farfesa David Di da mai bincike Zhao Baodan daga dakin gwaje-gwaje na Key na Jiha na kayan aikin gani na zamani, Makarantar Optoelectronics, Jami'ar Zhejiang da
Cibiyar Bincike ta kasa da kasa na Advanced Photonics, Haining International Campus, sun sami ci gaba mai mahimmanci a wannan hanya.Amfani da bipolar kwayoyin stabilizer, sun cimma matsananci-dogon aiki rayuwa a cikin perovskite LEDs wanda ya dace da bukatun aikace-aikace masu amfani.
"Wadannan perovskite LEDs an kori su ta hanyar 5 mA/c㎡ akai-akai na tsawon watanni 5 a jere (3600 hours) ba tare da raguwar haske ba," in ji David Dee.LED fahimtar.DominP1.56LED nuni.Waɗannan na'urori suna da ƙarfi sosai, kuma wasu gwaje-gwajen da ake ci gaba da yi suna da wahala a kammala su cikin shekara ɗaya ko fiye.Don samun bayanan rayuwa a cikin madaidaicin lokacin gwaji, LED haɓaka gwaje-gwajen tsufa yana buƙatar aiwatar da shi. ”
Waɗannan LEDs na perovskite masu infrared na kusa suna nuna tsawon rayuwan aiki.Misali, tare da haskakawar farko na 2.1 W sr-1 m-2 (a halin yanzu na 3.2 mA/c㎡), na'urar da aka kiyasta T50 tsawon rayuwa (lokacin da ake ɗauka don hasken farko ya ragu zuwa 50%) shine awanni 32675. shekaru 3.7).Ikon gani da aka bayar ta wannan annurin yana kama da koren OLED na kasuwanci wanda ke aiki a babban haske na 1000 cd/m2.A ƙaramin haske na 0.21 W sr-1 m-2 (1/10 na haske na sama) ko na yanzu na 0.7 mAc㎡, an kiyasta tsawon rayuwar T50 zuwa sa'o'i miliyan 2.4 (kimanin shekaru 270).
"Mun yi imanin cewa ya zama dole don yin ingantaccen bincike na rayuwa na wannan sabon LED, wanda muka tattara abubuwan bayanan rayuwa na na'urar 62 a cikin gwaje-gwajen tsufa na haɓaka, wanda ke rufe mafi girman yuwuwar ƙimar halin yanzu na kewayon 10-200 mA / c㎡."Guo Binging ya ce.Ingantacciyar ƙididdige ƙididdigewa ta waje (EQE) da ingantaccen canjin makamashi (ECE) na na'urar sun kai 22.8% da 20.7%, bi da bi, waɗanda sune mafi girman inganci na LEDs perovskite infrared kusa.
Mawallafa sun gano cewa waɗannan kayan aikin luminescent na perovskite suna da tsayayyen tsarin kristal."Tsarin crystal na kayan bai canza ba bayan fiye da kwanaki 322," in ji Zhao Baodan.
Dogon aiki da haɓaka gwaje-gwajen tsufa na LEDs perovskite (hoton hagu);
Bayanan ingancin ƙididdigewa na waje na sarrafawa da ingantattun na'urori (fashin dama)
"Wannan ya nuna cewa bipolar kwayoyin stabilizer taimaka perovskite don kula da ainihin crystal lokaci tare da kyau kwarai optoelectronic Properties. The crystal tsarin na kula da kula da perovskite samfurori canza muhimmanci da kuma rage a cikin makonni biyu."
Ion hijirarsa a cikin perovskites yana daya daga cikin muhimman abubuwan da ke haifar da rashin zaman lafiya, kuma wannan matsala ta zama mafi tsanani a ƙarƙashin rinjayar wutar lantarki mai amfani a cikin LEDs daMini LED nuni.Guo Binging ya ce: "Gwajin da muka yi da lissafinmu sun nuna cewa kwayoyin halittar bipolar suna haifar da haɗin gwiwar sinadarai ko hulɗa tare da ions a iyakokin hatsi na perovskite," in ji Guo Binging, "wanda zai iya zama dalilin da ya sa ƙaura ion ya zama mai wahala a cikin perovskites. "Gwajin lantarki da na gani da muka yi. Zhao Baodan ya kara da cewa tare da abokan aikinmu sun nuna yadda aka dakile lamarin motsin ion.
Sakamakon rayuwar na'urar ya nuna cewa kayan perovskite ba su da "lalacewar kwayoyin halitta" dangane da kwanciyar hankali."Sabbin na'urorin lantarki, irin su karfe halide perovskites, ana daukar su a matsayin rashin kwanciyar hankali, musamman a manyan filayen lantarki, kamar a aikace-aikacen LED," in ji David Dee."Sakamakon mu ya nuna cewa samun barga na'urorin perovskite ba 'ayyukan da ba zai yiwu ba'".
Ana sa ran tsawon rayuwar na'urar mai tsayi zai haɓaka amincewa a cikin filin LED na perovskite, saboda ya cika ainihin abin da ake buƙata na kwanciyar hankali don OLEDs na kasuwanci.Ana iya amfani da waɗannan LEDs na kusa-infrared a aikace-aikace kamar nunin infrared na kusa, sadarwa, da ilmin halitta.Ko da yake na'urorin perovskite masu haske masu haske masu kama da tsawon rayuwa sun kasance don haɓakawa, fahimtar manyan LEDs na perovskite LEDs yana ba da hanya ga fasahar luminescence na perovskite don shigar da aikace-aikacen masana'antu.
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Lura da tasirin ƙaura na ion na perovskite a ƙarƙashin filin lantarki ta hanyar gwajin hoto na microfluorescence
Lokacin aikawa: Agusta-24-2022