共掺Rb^(+)和Zn^(2+)蓝光钙钛矿量子点及其发光二极管  

Blue Perovskite Quantum Dot Co-doped with Rb^(+)/Zn^(2+) and Its Light Emitting Diodes

作　　者：肖毅 李丹阳 罗宇[1] 王俊杰[1] 刘森坤 张玉玲 彭俊彪[1] XIAO Yi;LI Dan-yang;LUO Yu;WANG Jun-jie;LIU Sen-kun;ZHANG Yu-ling;PENG Jun-biao(State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学发光材料与器件国家重点实验室,广东广州510641

出　　处：《发光学报》2022年第6期901-910,共10页Chinese Journal of Luminescence

基　　金：国家自然科学基金(62074059);广东省科技计划(2019B030302007,2019B010934001)资助项目。

摘　　要：共掺Rb^(+)、Zn^(2+)得到了(Cs_(0.8)Rb_(0.2))(Pb_(0.93)Zn_(0.07))(Br_(1.8)Cl_(1.2))蓝光钙钛矿量子点。相比未掺杂的CsPb(Br_(1.8)Cl_(1.2))量子点,Rb^(+)、Zn^(2+)与卤素离子(Br^(-)、Cl^(-))形成更加稳定的钙钛矿八面体晶型,抑制了Cl^(-)空位缺陷的形成,提高了量子点的稳定性。掺杂后的量子点溶液光致发光效率从未掺杂的5%显著提高到52%,同时辐射复合也得到了显著增强。Rb^(+)、Zn^(2+)共掺使量子点的HOMO能级上移0.31 eV,降低了从空穴传输层(HTL)到发光层(EML)的注入势垒,有利于空穴注入。基于Rb^(+)、Zn^(2+)共掺的蓝光钙钛矿量子点,设计了结构为ITO/PEDOT∶PSS/TFB/Pe⁃QDs/TPBi/LiF/Al的发光二极管器件,得到发光峰位于470 nm、半峰宽为19 nm的蓝光发射,最大外量子效率(EQE_(max))达到3.55%。(Cs_(0.8)Rb_(0.2))(Pb_(0.93)Zn_(0.07))(Br_(1.8)Cl_(1.2))blue light perovskite quantum dots were obtained by co-doping Rb^(+)and Zn^(2+).Compared with undoped CsPb(Br_(1.8)Cl_(1.2))quantum dots,Rb^(+),Zn^(2+)and hal⁃ogen ions(Br^(-),Cl^(-))form a more stable perovskite octahedral crystal,which inhibits the formation of Cl^(-)vacancy defects,which improves the stability of quantum dots.The photoluminescence effi⁃ciency of the doped quantum dot solution was significantly improved from the undoped 5%to 52%,and the radiative recombination was also significantly enhanced.The co-doping of Rb^(+)and Zn^(2+)shifts the HOMO level of the quantum dots up by 0.31 eV,which reduces the injection barrier from the hole transport layer(HTL)to the emissive layer(EML),which is beneficial to hole injection.Based on blue perovskite quantum dots co-doped with Rb^(+)and Zn^(2+),a light-emitting device with the structure of ITO/PEDOT∶PSS/TFB/Pe-QDs/TPBi/LiF/Al was designed.For blue light emission at 19 nm,the maximum external quantum efficiency(EQE_(max))reaches 3.55%.

关 键 词：钙钛矿量子点 蓝光发射 Rb^(+)、Zn^(2+)掺杂 晶格适配 

分 类 号：TN312.8[电子电信—物理电子学] O482.31[理学—固体物理]