In recent years,all-inorganic halide perovskite quantum dots(QDs)have drawn attention as promising candi-dates for photodetectors,light-emitting diodes,and lasing applications.However,the sensitivity and instability of perovskite to moisture and heat seriously restrict their practical application to optoelectronic devices.Recently,a facile ligand-engineering strategy to suppress aggregation by replacing traditional long ligands oleylamine(OAm)during the hot injection process has been reported.Here,we further explore its thermal stability and the evolution of photoluminescence quantum yield(PLQY)under ambient environment.The modified CsPbBr3 QDs film can maintain 33％of initial PL intensity,but only 17％is retained in the case of unmodified QDs after 10 h con-tinuous heating.Further,the obtained QDs with higher initial PLQY(91.8％)can maintain PLQY to 39.9％after being continuously exposed in air for 100 days,while the PLQY of original QDs is reduced to 5.5％.Furthermore,after adhering CsPbBr3 QDs on the surface of a micro SiO2 sphere,we successfully achieve the highly-efficient upconversion random laser.In comparison with the unmodified CsPbBr3 QDs,the laser from the modified CsPbBr3 QDs presents a decreased threshold of 79.81 μJ/cm2 and higher quality factor(Q)of 1312.This work may not only provide a facile strategy to synthesize CsPbBr3 QDs with excellent photochemical properties but also a bright prospect for high-performance random lasers.

QIAN XIONG;SIHAO HUANG;ZIJUN ZHAN;JUAN DU;XIAOSHENG TANG;ZHIPING HU;ZHENGZHENG LIU;ZEYU ZHANG;WEIWEI CHEN;YUXIN LENG

State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science,Shanghai Institute of Optics and Fine Mechanics(SIOM),Chinese Academy of Sciences(CAS),Shanghai 201800,China;Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China;School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;School of Physics and Electronics,Shandong Normal University,Jinan 250014,China;College of Optoelectronic Engineering,Chongqing University of Post and Telecommunications,Chongqing 400065,China

光子学研究（英文）

[1]QIAN XIONG;SIHAO HUANG;ZIJUN ZHAN;JUAN DU;XIAOSHENG TANG;ZHIPING HU;ZHENGZHENG LIU;ZEYU ZHANG;WEIWEI CHEN;YUXIN LENG-.Surface ligand modified cesium lead bromide/silica sphere composites for low-threshold upconversion lasing)[J].光子学研究（英文）,2022(03):628-636

oleylamine,OAm

Surface,cesium,lead,bromide,silica,sphere,composites,low,threshold,upconversion,lasing,In,recent,years,all,inorganic,halide,perovskite,quantum,dots,QDs,have,drawn,attention,promising,candi,dates,photodetectors,light,emitting,diodes,applications,However,sensitivity,instability,moisture,seriously,restrict,their,practical,optoelectronic,devices,Recently,facile,engineering,strategy,suppress,aggregation,by,replacing,traditional,long,ligands,during,injection,process,has,been,reported,Here,further,explore,its,thermal,evolution,photoluminescence,yield,PLQY,under,ambient,environment,CsPbBr3,film,maintain,initial,intensity,but,only,retained,case,unmodified,after,heating,obtained,higher,being,continuously,exposed,air,days,while,original,reduced,Furthermore,adhering,surface,micro,SiO2,successfully,achieve,highly,efficient,random,comparison,from,presents,decreased,quality,This,work,may,not,provide,synthesize,excellent,photochemical,properties,also,bright,prospect,performance,lasers

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