Kutshanje, iqela lophando likaNjingalwazi uXiao Zhengguo ovela kwiSikolo seFiziksi kwiYunivesithi yeSayensi kunye neTekhnoloji yaseTshayina, iLabhoratri ePhambili ye-Quantum Material Physics ye-Chinese Academy yeSayensi kunye neHefei National Research Centre ye-Microscale Material Science iye yenza ukubaluleka. inkqubela phambili kwintsimi yokulungiselela i-crystal esebenzayo kunye ne-stable perovskite enyeii-LEDs.

Iqela lophando liye lakhula umgangatho ophezulu, indawo enkulu kunye ne-ultra-thin perovskite ikristale enye ngokusebenzisa indlela yokuthintela indawo, kwaye ilungiselele i-perovskite ikristale eyodwa ye-LED ngokukhanya okungaphezulu kwe-86000 cd / m2 kunye nobomi ukuya kuthi ga kwi-12500 h okokuqala, othathe inyathelo elibalulekileyo ekusetyenzisweni kwe-perovskite LED ebantwiniukukhanya. Impumelelo echaphazelekayo, enesihloko esithi "Iphezulu eqaqambileyo kwaye izinzile i-single-crystal perovskite light-emitting diode", yapapashwa kwi-Nature Photonics ngoFebruwari 27.

I-Metal halide perovskite iye yaba sisizukulwana esitsha sokubonisa i-LED kunye nezixhobo zokukhanyisa ngenxa ye-wavelength yayo edibeneyo, i-half-peak ububanzi obuncinci kunye nokulungiswa kobushushu obuphantsi. Okwangoku, ukusebenza kakuhle kwe-quantum yangaphandle (EQE) ye-perovskite LED (PeLED) esekelwe kwifilimu ye-polycrystalline encinci idlule i-20%, xa kuthelekiswa ne-LED ye-organic commercial (OLED). Kwiminyaka yakutshanje, ubomi benkonzo yobuninzi beengxelo eziphezulu ze-perovskiteIzixhobo ze-LEDukusuka kumakhulu ukuya kumawaka eeyure, zisasemva kwee-OLED. Ukuzinza kweso sixhobo kuya kuchaphazeleka yizinto ezifana nokuhamba kwe-ion, ukufakelwa kwe-carrier engalinganiyo kunye nokushisa kwe-joule okwenziwa ngexesha lokusebenza. Ukongeza, i-Auger recombination enzulu kwizixhobo ze-polycrystalline perovskite nazo zinciphisa ukukhanya kwezixhobo.

Ukuphendula ezi ngxaki zingasentla, iqela lophando lika-Xiao Zhengguo lisebenzise indlela yokuthintela indawo ukukhulisa i-perovskite iikristale enye kwi-substrate in situ. Ngokulungelelanisa iimeko zokukhula, ukwazisa i-amines ephilayo kunye neepolymers, umgangatho we-crystal uphuculwe ngokufanelekileyo, ngaloo ndlela ulungiselela umgangatho ophezulu we-MA0.8FA0.2PbBr3 i-crystals enye encinci kunye nobukhulu obuncinci be-1.5 μ m. Uburhabaxa bomphezulu bungaphantsi kwe-0.6 nm, kwaye isivuno sangaphakathi se-fluorescence quantum (PLQYINT) sifikelela kwi-90%. Isixhobo se-perovskite se-crystal ye-LED esilungiselelwe nge-crystal enye encinci njengoko i-light etting layer ine-EQE ye-11.2%, ukukhanya okungaphezulu kwe-86000 cd / m2, kunye nobomi be-12500 h. Iqale yafikelela kumda wokuthengisa, kwaye ibe yenye yezona zixhobo ezizinzile ze-perovskite ze-LED okwangoku.

Umsebenzi ongentla ubonisa ngokupheleleyo ukuba ukusebenzisa i-crystal perovskite encinci njenge-crystal ekhanyayo njengesisombululo esinokwenzeka kwingxaki yokuzinza, kwaye i-perovskite i-crystal LED enye inethemba elikhulu kwintsimi yokukhanyisa komntu kunye nokubonisa.