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Preparation of γ‐aluminum oxynitride phosphor with Eu doping by direct nitridation in ammonia and postannealing
Author(s) -
Zhang Li,
Luo Huan,
Zhou Linan,
Liu Qian,
Li Junfeng,
Zhang Wentao
Publication year - 2018
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.15494
Subject(s) - phosphor , materials science , photoluminescence , analytical chemistry (journal) , spinel , doping , calcination , ceramic , aluminium , particle size , mineralogy , luminescence , ammonia , chemical engineering , metallurgy , chemistry , catalysis , biochemistry , optoelectronics , chromatography , engineering , organic chemistry
γ‐aluminum oxynitride (γ‐AlON) with spinel structure has attracted much attention for structural and functional application. γ‐AlON powders were successfully prepared by direct nitridation method of Al/Al(OH) 3 starting mixture in ammonia and then calcined at high temperature. XRD, SEM, TEM, EDX, and photoluminescence were conducted to investigate the detail procedure and the optical properties of AlON: xEu phosphors. Nitrogen was introduced by the nitridation of metallic aluminum, appropriate Al amount and nitridation condition was necessary to obtain phase pure γ‐AlON. The as‐prepared AlON powders exhibited multifaceted grain morphology with fine particle size (1‐5 μm). Eu 2 O 3 activator was reduced and transformed to EuAl 12 O 19 by reaction with alumina, which remained in the product when x > 0.25%. Under 331 nm excitation, AlON: xEu phosphors exhibited emission bands of 475 and 410 nm. 475 nm band reached a plateau at x = 0.25% due to the solubility of Eu 2+ ion in AlON, whereas 410 nm band showed a linear increase in intensity with Eu 2+ doping amount, which was believed to be the contribution of EuAl 12 O 19 . The present approach combination of direct nitridation in ammonia and postcalcination process showed potential application for AlON ceramic and AlON phosphors.