Surface Anchoring‐Induced Robust Luminescence Thermal Quenching Suppression in Shell‐Free Perovskite Nanocrystals. Issue 22 (30th August 2022)

• Record Type: Journal Article
• Authors: Hu, Xudong; Wu, Yuting; Wang, Yue; Xu, Lili; Zhang, Shengli; Wang, Junhui; Wu, Kaifeng; Liu, Yang; Li, Yuelei; Li, Xiaoming
• Is Part Of: Advanced optical materials. Volume 10:Issue 22(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-08-30
• Subjects: antithermal quenching -- luminescence temperature quenching -- perovskite nanocrystals -- surface anchoring -- thermally stable lasing; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202201205
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: The luminescence thermal quenching (LTQ) behavior is one of the detrimental effects which result in poor stability and hinder the practical applications of luminescent nanocrystals (NCs) severely. Suppressing the LTQ effect is fundamentally important, especially for the recent rising star lead halide perovskite NCs while related investigations are rare. Herein, taking CsPbBr3 NCs with high photoluminescence quantum yield (PLQY) as examples, a surface anchoring mechanism is proposed and the LTQ effect is successfully overcome. By introducing hybrid ligand system with large binding effect and steric hindrance, ligand desorption induces irreversible LTQ effect and the formation of surface atom vibration related transient traps is suppressed. As a result, 96.3% and 75.6% of the initial PL intensity are maintained up to 378 and 423 K, respectively, which are even superior to conventional core–shell NCs. Notably, after being treated under 333 K for 15 days, a PL intensity remnant of >88.4% is achieved. Such anti‐LTQ mechanism is also extended to blue perovskite NCs. Temperature‐tolerant stimulated emission and high temperature lasing phenomenon are fulfilled with considerable thermal stability. This work provides a new mechanism which can possibly help to solve the bottleneck toward practical luminescence applications for perovskite nanostructures. Abstract : Hybrid ligand system based on 4‐dodecylbenzene sulfonic acid and tri‐n‐octylphosphine suppresses the formation of both permanent and transient exciton traps successfully via reducing surface ligand desorption and surface atom vibration. Robust antithermal quenching effect for CsPbBr3 nanocrystals is achieved that 96.3% and 75.6% of the initial photoluminescence intensity are maintained when heating up to 378 and 423 K, respectively.