Muva nje, ithimba likaSolwazi uXiao Zhengguo labacwaningi abavela eSikoleni SeFiziksi saseNyuvesi Yesayensi Nobuchwepheshe YaseChina, Ilabhorethri Ebalulekile Ye-Strongly Coupled Quantum Material Physics ye-Chinese Academy of Sciences kanye ne-Hefei National Research Centre for Microscale Material Science yenze kwabaluleka. inqubekelaphambili emkhakheni wokulungiselela i-perovskite eyodwa esebenza kahle futhi ezinzileAma-LED.

Ithimba labacwaningi likhulise amakristalu e-perovskite esezingeni eliphezulu, endaweni enkulu futhi emincane kakhulu ngokusebenzisa indlela yokuvimbela isikhala, futhi lalungisa i-perovskite i-crystal LED enokukhanya okungaphezu kuka-86000 cd/m2 nempilo efinyelela ku-12500 h okokuqala, okuthathe isinyathelo esibalulekile ekusetshenzisweni kwe-perovskite LED kumuntuukukhanya. Izimpumelelo ezifanele, ezinesihloko esithi “Ama-diode akhipha ukukhanya e-crystal perovskite agqamile futhi azinzile”, ashicilelwe ku-Nature Photonics ngoFebhuwari 27.

I-Metal halide perovskite isiphenduke isizukulwane esisha sesibonisi se-LED nezinto zokukhanyisa ngenxa ye-wavelength yayo eguquguqukayo, ububanzi obuncane be-half-peak kanye nokulungiselela izinga lokushisa eliphansi. Njengamanje, ukusebenza kahle kwe-quantum yangaphandle (EQE) ye-perovskite LED (PeLED) esekelwe kufilimu encane ye-polycrystalline yeqe u-20%, uma kuqhathaniswa ne-commercial organic LED (OLED). Eminyakeni yamuva, impilo yesevisi yeningi le-perovskite esebenza kahle kakhulu ebikiweImishini ye-LEDisukela kumakhulu kuya ezinkulungwaneni zamahora, isasele ngemuva kwama-OLED. Ukuzinza kwedivayisi kuzothintwa yizici ezifana nokunyakaza kwe-ion, ukufakwa okungenakulinganisela kwenkampani yenethiwekhi nokushisa kwe-joule okukhiqizwa phakathi nokusebenza. Ngaphezu kwalokho, ukuhlanganisa kabusha kwe-Auger kumadivayisi we-polycrystalline perovskite nakho kukhawulela ukukhanya kwamadivayisi.

Ekuphenduleni izinkinga ezingenhla, ithimba labacwaningi lika-Xiao Zhengguo lisebenzise indlela yokuvimbela isikhala ukuze kukhule amakristalu e-perovskite ku-substrate in situ. Ngokulungisa izimo zokukhula, ukwethula ama-amine ephilayo nama-polymers, ikhwalithi yekristalu yathuthukiswa ngokuphumelelayo, ngaleyo ndlela ilungiselela amakristalu angawodwa amancane amancane angu-1.5 μm wekhwalithi ephezulu. Ubulukhuni obungaphezulu bungaphansi kuka-0.6 nm, kanti isivuno sangaphakathi se-fluorescence quantum (PLQYINT) sifinyelela ku-90%. Idivayisi ye-perovskite yekristalu eyodwa ye-LED elungiselelwe nge-crystal eyodwa encane njengoba ungqimba olukhipha ukukhanya lune-EQE ye-11.2%, ukukhanya okungaphezu kuka-86000 cd/m2, nempilo yonke ye-12500 h. Iqale yafinyelela emngceleni wokuthengisa, futhi isibe enye yamadivayisi we-LED we-perovskite azinzile njengamanje.

Umsebenzi ongenhla ubonisa ngokugcwele ukuthi ukusebenzisa i-crystal perovskite encane njengengqimba ekhipha ukukhanya kuyisixazululo esinokwenzeka senkinga yokuzinza, nokuthi i-perovskite i-crystal LED eyodwa inethemba elikhulu emkhakheni wokukhanyisa nokubonisa komuntu.