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Manipulation of upconversion property and enhancement of sensitivity by tailoring the local structure
Author(s) -
Lai Fengqin,
Cheng Hao,
Jiang Zhong,
Liu Chao,
Liang Tongxiang,
You Weixiong
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17485
Subject(s) - monoclinic crystal system , phosphor , photon upconversion , luminescence , materials science , ion , crystal structure , phase (matter) , crystal (programming language) , crystal growth , analytical chemistry (journal) , nanotechnology , crystallography , mineralogy , optoelectronics , chemistry , organic chemistry , chromatography , computer science , programming language
Tailoring the local crystal environment around the activators is one of an important way to enhance the upconversion (UC) luminescence intensity. Herein, we substitute the Y 3+ lattice with La 3+ ion gradually in Y 2 Ti 2 O 7 :Yb 3+ , Er 3+ phosphor and investigate the effect of La 3+ concentration on the UC luminescent properties as well as the temperature sensing behaviors. During the phase transformation process from cubic Y 2 Ti 2 O 7 to monoclinic La 2 Ti 2 O 7 , the La 3+ ions also play an important role on the adjustment of size and morphology of particles. Furthermore, the cooperation of La 3+ ion is in favor of the crystal growth toward the easy growth directions. The UC luminescence intensities can be enhanced efficiently with the increasing of La 3+ concentration. The sensitivity for temperature sensing can be improved by the increasing of La 3+ concentration in the Y 2 Ti 2 O 7 and La 2 Ti 2 O 7 two‐phase coexistence system and the maximum S A is 45.3 × 10 −4 K −1 at 410K when the La 3+ concentration is 80%. The maximum S A and corresponding temperature can be adjusted by controlling the La 3+ concentration, which means that (Y 0.94‐x La x ) 2 Ti 2 O 7 : Er 3+ /Yb 3+ phosphors may be applicable to different working environment.