Achieving high efficiency and stable pure blue colloidal perovskite quantum dot(QD)light-emitting diodes(LEDs)is still an enormous challenge because blue emitters typically exhibit high defect density,low photolumines...Achieving high efficiency and stable pure blue colloidal perovskite quantum dot(QD)light-emitting diodes(LEDs)is still an enormous challenge because blue emitters typically exhibit high defect density,low photoluminescence quantum yield(PLQY)and easy phase dissociation.Herein,an organic cation composition modification strategy is used to synthesize high-performance pure blue perovskite quantum dots at room temperature.The synthesized FACsPb(Cl_(0.5)Br_(0.5))_(3) QDs show a bright photoluminescence with a high PLQY(65%),which is 6 times higher than the undoped samples.In addition,the photophysical properties of the FA cation doping was deeply illustrated through carrier dynamics and first principal calculation,which show lower defects,longer lifetime,and more reasonable band gap structure than undoped emitters.Consequently,pure blue FA-CsPb(Cl_(0.5)Br_(0.5))_(3) QDs light-emitting devices were fabricated and presented a maximum luminance of 1452 cdm^(−2),and an external quantum efficiency of 5.01% with an emission at 474 nm.The excellent photoelectric properties mainly originate from the enhanced blue QDs emitter and effective charge injection and exciton radiation.Our finding underscores this easy and feasible room temperature doping approach as an alternative strategy to blue perovskite QD LED development.展开更多
基金the National Natural Science Foundation of China(No.61804063)the National Key Research and Development Program of China(No.2019YFA0705900)funded by MOST.+4 种基金Key Projects of Jilin Province Science and Technology Development Plan(No.20220201070GX)the Natural Science Foundation of Jilin Province(No.20190201208JC)the support from the Hong Kong Research Grant Council for the GRF grant(No.11314122)research funding from the City University of Hong Kong and the support from Guangdong Major Project of Basic and Applied Basic Research(No.2019B030302007)Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials(No.2019B121205002).
文摘Achieving high efficiency and stable pure blue colloidal perovskite quantum dot(QD)light-emitting diodes(LEDs)is still an enormous challenge because blue emitters typically exhibit high defect density,low photoluminescence quantum yield(PLQY)and easy phase dissociation.Herein,an organic cation composition modification strategy is used to synthesize high-performance pure blue perovskite quantum dots at room temperature.The synthesized FACsPb(Cl_(0.5)Br_(0.5))_(3) QDs show a bright photoluminescence with a high PLQY(65%),which is 6 times higher than the undoped samples.In addition,the photophysical properties of the FA cation doping was deeply illustrated through carrier dynamics and first principal calculation,which show lower defects,longer lifetime,and more reasonable band gap structure than undoped emitters.Consequently,pure blue FA-CsPb(Cl_(0.5)Br_(0.5))_(3) QDs light-emitting devices were fabricated and presented a maximum luminance of 1452 cdm^(−2),and an external quantum efficiency of 5.01% with an emission at 474 nm.The excellent photoelectric properties mainly originate from the enhanced blue QDs emitter and effective charge injection and exciton radiation.Our finding underscores this easy and feasible room temperature doping approach as an alternative strategy to blue perovskite QD LED development.
