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

Nano Research 2020年第7期13卷 1962-1969页

作者： Andres Granados del Aguila TThu Ha Do Jun Xing Wen Jie Jee Jacob B.Khurgin Qihua Xiong Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore Key Laboratory of Eco-Chemical Engineering Ministry of EducationCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Department of Electrical and Computer Engineering Johns Hopkins UniversityBaltimoreMaryland 21218USA State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China

up-conversion photoluminescence(UCPL)refers to the elementary process where low-energy photons are converted into high-energy ones via consecutive interactions inside a *** additional energy is provided by intermnal thermal energy in the form of lttice vibrations(phonons),the process is called phonon-assisted ***,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 *** 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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Strain and illumination triggered regulations of up-conversion luminescence in Er-doped Bi_(0.5)Na_(0.5)TiO_(3)-BaTiO_(3)/Mica flexible multifunctional thin films

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Journal of Materiomics 2022年第3期8卷 586-595页

作者： Yang Zhou Rui Xiong Peng Wang Xiao Wu Baisheng Sa Cong Lin Min Gao Tengfei Lin Chunlin Zhao College of Materials Science and Engineering Fuzhou UniversityFuzhou350108China

External stimuli induced effective regulations of luminescent material are of significant interest in the development of smart optical ***,by simply doping with Er^(3+) in the 0.94Bi_(0.5)Na_(0.5)TiO_(3)-0.06BaTiO_(3)(BNTBT)ferroelectric host,using the bendable mica substrate,and exerting mechanical strain(bending)or light illumination(via photochromic reaction),the all-inorganic,highly-transparent and flexible Er-doped BNTBT/Mica luminescent-ferroelectric thin films were designed and fabricated,displaying strain-induced dramatically elevation of up-conversion photoluminescence(PL)intensity,suppression of PL concentration quenching,outstanding endurance and durability,convenient illuminationmediated PL *** the strain-induced structural changes and local lattice distortions of the thin films were further explored through theoretical calculations and Raman *** results can supply the guidance of designing other luminescent-ferroelectric materials with controlled PL properties via easy mechanical/photo stimuli for expanding the application of multifunctional wearable memory devices.

关键词： Luminescent-ferroelectrics Flexibility Mechanical strain up-conversion photoluminescence Photochromic

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