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Significantly improved photoluminescence of the green‐emitting β‐sialon:Eu 2+ phosphor via surface coating of TiO 2
Author(s) -
Zhang Chenning,
Uchikoshi Tetsuo,
Xie RongJun,
Liu Lihong,
Sakka Yoshio,
Hirosaki Naoto
Publication year - 2019
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.15909
Subject(s) - phosphor , materials science , photoluminescence , coating , anatase , nanoparticle , layer (electronics) , surface plasmon resonance , chemical engineering , luminescence , optoelectronics , nanotechnology , photocatalysis , chemistry , biochemistry , engineering , catalysis
The β‐sialon:Eu 2+ phosphor particles were successfully coated by TiO 2 nanoparticles via the sol‐gel method. The TiO 2 ‐coated β‐sialon:Eu 2+ phosphor had a significantly improved photoluminescence ( PL ) performance under the 365 nm excitation, due to the localized surface plasmon resonance ( LSPR ) at the interface between the TiO 2 coating layer and phosphor surface. The emission intensity of the TiO 2 ‐coated β‐sialon:Eu 2+ prepared with the titanium ( IV ) tetrabutoxide (Ti(OC 4 H 9 ) 4 , TTBO ):H 2 O = 1:0.5 volume ratio was dramatically increased by ~24%. When the preparation temperature was 500°C, it was responsible for superior PL intensity by considering the important domination factors of higher anatase content and spherical particle shape of the TiO 2 coating layer to the LSPR effect. The coating around the phosphor surface by the TiO 2 nanoparticles would be an effective technique to improve the PL efficiency of phosphor for the application in the white light‐emitting diodes ( LED s), by utilizing the LSPR effect of the semiconductor coating layer, instead of conventional metal plasmonic materials.