Posachedwapa, gulu lofufuza la Pulofesa Xiao Zhengguo ku School of Physics of the University of Science and Technology of China, Key Laboratory of Strongly Coupled Quantum Material Physics of the Chinese Academy of Sciences ndi Hefei National Research Center for Microscale Material Science yakhala yofunika kwambiri. kupita patsogolo pakukonzekera koyenera komanso kokhazikika kwa perovskite single crystalMa LED.

Gulu lofufuza lakula makhiristo apamwamba kwambiri, am'dera lalikulu komanso owonda kwambiri a perovskite pogwiritsa ntchito njira yoletsa malo, ndikukonza perovskite single crystal LED yokhala ndi kuwala kopitilira 86000 cd/m2 ndi moyo mpaka 12500 h. nthawi yoyamba, yomwe yatenga sitepe yofunika kwambiri kwa ntchito perovskite LED kwa anthukuyatsa. Zomwe zakwaniritsidwa, zomwe zili ndi mutu wakuti "Mawonekedwe apamwamba komanso okhazikika a single-crystal perovskite light-emitting diode", adasindikizidwa mu Nature Photonics pa February 27.

Metal halide perovskite yakhala m'badwo watsopano wa mawonetsedwe a LED ndi zida zowunikira chifukwa cha kutalika kwake kosinthika, m'lifupi mwake ndi theka lapamwamba komanso kukonzekera kocheperako. Pakalipano, mphamvu ya kunja kwa quantum (EQE) ya perovskite LED (PeLED) yochokera ku polycrystalline filimu yopyapyala yadutsa 20%, yofanana ndi malonda a LED (OLED). M'zaka zaposachedwa, moyo wautumiki wa perovskite wochita bwino kwambiriZida za LEDkuyambira mazana mpaka masauzande a maola, akadali kumbuyo kwa OLED. Kukhazikika kwa chipangizochi kudzakhudzidwa ndi zinthu monga mayendedwe a ion, kuyika kwa chonyamulira mopanda malire ndi kutentha kwa joule komwe kumapangidwa panthawi yogwira ntchito. Kuphatikiza apo, kukonzanso kwakukulu kwa Auger mu zida za polycrystalline perovskite kumachepetsanso kuwala kwa zida.

Poyankha mavuto omwe ali pamwambawa, gulu lofufuza la Xiao Zhengguo linagwiritsa ntchito njira yoletsa malo kuti ikule perovskite makhiristo amodzi pa gawo lapansi. Posintha momwe zinthu zikukulirakulira, poyambitsa ma organic amines ndi ma polima, mtundu wa kristalo udawongoleredwa bwino, potero kukonzekera makristalo apamwamba kwambiri a MA0.8FA0.2PbBr3 ocheperako omwe ali ndi makulidwe osachepera 1.5 μ m. Kukula kwapamtunda ndi kochepera 0.6 nm, ndipo zokolola zamkati za fluorescence quantum (PLQYINT) zimafika 90%. Chipangizo cha perovskite single crystal LED chokonzedwa ndi kristalo wochepa kwambiri monga kuwala kotulutsa kuwala kumakhala ndi EQE ya 11.2%, kuwala koposa 86000 cd / m2, ndi moyo wa 12500 h. Poyamba yafika pakhomo la malonda, ndipo yakhala imodzi mwa zipangizo zokhazikika kwambiri za perovskite LED pakalipano.

Ntchito yomwe ili pamwambayi ikuwonetseratu kuti kugwiritsa ntchito kristalo wochepa kwambiri wa perovskite monga kuwala kotulutsa kuwala ndi njira yothetsera vuto lokhazikika, komanso kuti perovskite single crystal LED ili ndi chiyembekezo chachikulu pa ntchito yowunikira anthu ndi kuwonetsera.