Efficient up-conversion photoluminescence in all-inorganic lead halide perovskite nanocrystals

查看全文 作　　者：Andres Granados del [1]Aguila;TThu Ha [1]Do;Jun [2]Xing;Wen Jie [1]Jee;Jacob [3]B.Khurgin;Qihua [1,4]Xiong

机构地区：[1]Division of Physics and Applied Physics,School of Physical and Mathematical Sciences,Nanyang Technological University,Singapore 637371,Singapore;[2]Key Laboratory of Eco-Chemical Engineering,Ministry of Education,College of Chemistry and Molecular Engineering,Qingdao University of Science and Technology,Qingdao 266042,China;[3]Department of Electrical and Computer Engineering,Johns Hopkins University,Baltimore,Maryland 21218,USA;[4]State Key Laboratory of Low-Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing 100084,China

出　　处：《Nano Research》索引2020年第13卷第7期,共8页

基　　金：the Singapore National Research Foundation through the NRF Investigatorship Award(No.NRF-NRFI2015-03);the Singapore Ministry of Education via AcRF Tier 3 Programme(No.MOE2018-T3-1-002),Tier 2 grant(No.MOE2018-T2-2-068)and Tier 1 grants(Nos.RG103/15 and RG113/16);A.G.D.A.gratefully acknowledges the financial support of the Presidential Postdoctoral Fellowship program of the Nanyang Technological University 摘　　要：Up-conversion photoluminescence(UCPL)refers to the elementary process where low-energy photons are converted into high-energy ones via consecutive interactions inside a medium.When additional energy is provided by intermnal thermal energy in the form of lttice vibrations(phonons),the process is called phonon-assisted UCPL.Here,we report the exceptionally large phonon-assisted energy gain of up to^8kgT(kg is Boltzmann constant,T is temperature)on all-inorganic lead halide perovskite semiconductor colloidal nanocrystals that goes beyond the maximum capabilty of only harvesting optical phonon modes.By systematic optical study in combination with a statistical probability model,we explained the nontrivial phonon-assisted UCPL process in perovskites nanocrystals,where in addition to the strong electron-phonon(light-matter)coupling,other nonlinear processes such as phonon-phonon(matter-matter)interaction also effectively boost the up-conversion efficiency. 关键词：up-conversion photoluminescence PHONONS lead halide perovskite colloidal nanocrystals

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Efficient up-conversion photoluminescence in all-inorganic lead halide perovskite nanocrystals

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