Journal
ADVANCED OPTICAL MATERIALS
Volume 9, Issue 19, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202100601
Keywords
halide ion migration; halide perovskites; nanocrystals; organogels; photoluminescence; white-light emission
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Funding
- Department of Science and Technology [CRG/2020/002756]
- Kerala State Council for Science, Technology, and Environment [KSCSTE/1538/2018-KSYSA-RG]
- CSIR
- UGC
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This study reports a method of using PF gel to modify the surface of CsPbBr1.5I1.5 based mixed halide PNCs, which can effectively suppress halide ion migration and achieve stable and efficient white light emission.
Luminescent perovskite nanocrystals (PNCs) receive great attention in recent years due to their sharp, intense, and easily tunable photoluminescence, suitable for optoelectronic applications. However, in reality, the emission bandgap tunability is limited due to rapid halide ion migration, commonly occurring in mixed halide perovskites. Consequently, it is challenging to produce white-light emission by mixing PNCs having different emission colors. In this work, using a blue-emitting polyfluorene (PF) to passivate the surface of yellow-emitting CsPbBr1.5I1.5 based mixed halide PNC is reported not only to suppress the halide ion migration but also to generate stable and efficient white-light emission through controlled excitation energy transfer from the former to the latter. PF gel arrests the detachment of capping ligands from the surface of nanocrystals, thereby hinders the halide ion migration and prevents the generation of related trap states. Consequently, the nonradiative recombination of photogenerated charge carriers has significantly reduced, resulting in the overall enhancement of the luminescence characteristics of the nanocrystals.
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