Premium
Novel Self‐Activated Zinc Gallogermanate Phosphor: The Origin of its Photoluminescence
Author(s) -
Ren Jing,
Xu Xiaoqing,
Zeng Huidan,
Chen Guorong,
Kong Deshuang,
Gu Changjun,
Chen Chunming,
Liu Zhibin,
Kong Linren
Publication year - 2014
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.13103
Subject(s) - phosphor , luminescence , photoluminescence , thermoluminescence , zinc , electron paramagnetic resonance , materials science , dopant , persistent luminescence , analytical chemistry (journal) , doping , chemistry , optoelectronics , nuclear magnetic resonance , metallurgy , physics , chromatography
Since 2012, zinc gallogermanate has drawn interests as an excellent host phosphor for a variety of dopants (e.g., Cr 3+ , Bi 3+ and Mn 2+ ). However, the origin of its self‐activated luminescence has been largely unknown. Here, zinc gallogermanate of the composition Zn 1+ x Ga 2−2 x Ge x O 4 (0 ≤ x ≤ 1) is prepared by solid‐state reaction, and the evolution of the crystal structure with the composition is studied. The phosphors show a broad white‐bluish emission upon excitation by ultraviolet (UV) light, and the luminescence intensity greatly increases as Ga 3+ are substituted by Ge 4+ . A full spectrum of the defects and trap centers responsible for the luminescence is given by a multiple characterization methods, such as low temperature electron spin resonance, positron annihilation lifetime and thermoluminescence spectra. The results show that the zinc gallogermanate is a promising self‐activated phosphor for a variety of applications.