Peng Kuan-Hsueh, Yang Sheng-Hsiung, Wu Zong-Yu, Hsu Hsu-Cheng
Institute of Lighting and Energy Photonics, National Chiao Tung University, No. 301, Gaofa 3rd Road, Guiren District, Tainan City 71150, Taiwan, ROC.
Department of Photonics, National Cheng Kung University, No. 1, University Road, East District, Tainan City 70101, Taiwan, ROC.
ACS Omega. 2021 Apr 7;6(15):10437-10446. doi: 10.1021/acsomega.1c00910. eCollection 2021 Apr 20.
Two new phosphine ligands, diphenylmethylphosphine (DPMP) and triphenylphosphine (TPP), were introduced onto cesium lead bromoiodide nanocrystals (CsPbBrI NCs) to improve air stability in the ambient atmosphere. Incorporating DPMP or TPP ligands can also enhance film-forming and optoelectronic properties of the CsPbBrI NCs. The results reveal that DPMP is a better ligand to stabilize the emission of CsPbBrI NCs than TPP after storage for 21 days. The increased carrier lifetime and photoluminescence quantum yield (PLQY) of perovskite NCs are due to the surface passivation by DPMP or TPP ligands, which reduces nonradiative recombination at the trap sites. The DPMP and TPP-treated CsPbBrI NCs were successfully utilized as red emitters for fabricating perovskite light-emitting diodes with enhanced performance and prolonged device lifetime relative to the pristine one.
两种新型膦配体，二苯基甲基膦（DPMP）和三苯基膦（TPP），被引入到溴碘化铯铅纳米晶体（CsPbBrI NCs）中，以提高其在环境大气中的空气稳定性。掺入DPMP或TPP配体还可以增强CsPbBrI NCs的成膜性能和光电性能。结果表明，在储存21天后，DPMP是比TPP更好的用于稳定CsPbBrI NCs发光的配体。钙钛矿纳米晶体的载流子寿命和光致发光量子产率（PLQY）的增加归因于DPMP或TPP配体的表面钝化，这减少了陷阱位点处的非辐射复合。相对于原始的CsPbBrI NCs，经DPMP和TPP处理的CsPbBrI NCs成功用作红色发光体，用于制造性能增强且器件寿命延长的钙钛矿发光二极管。
