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Enhanced photoluminescence of the Ca 0.8 Zn 0.2 TiO 3 :0.05% Pr 3+ phosphor by optimized hydrothermal conditions
Author(s) -
Xia Mao,
Wang Guanhua,
Gu Zhiqiang,
Qiu Zhongxian,
Rong Chunying,
Zhang Jilin,
Zhou Wenli,
Yu Liping,
Lian Shixun
Publication year - 2017
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3283
Subject(s) - phosphor , photoluminescence , hydrothermal circulation , materials science , chromaticity , analytical chemistry (journal) , diffractometer , calcium titanate , hydrothermal synthesis , spectroscopy , titanate , luminescence , mineralogy , chemistry , chemical engineering , scanning electron microscope , optoelectronics , optics , ceramic , metallurgy , physics , chromatography , quantum mechanics , engineering , composite material
The red‐emitting phosphor Ca 0.8 Zn 0.2 TiO 3 :Pr 3+ was synthesized using an ethylene glycol (EG)‐assisted hydrothermal method. The effects of additional amounts of and order of adding EG, plus hydrothermal temperature, time, and pH on the composition, morphology and optical properties of the titanate phosphors were studied. The crystalline phases of the titanate phosphors were confirmed to be constituted of a series of co‐existing CaTiO 3 , Zn 2 TiO 4 and Ca 2 Zn 4 Ti 16 O 38 compounds in various proportions that were visualized using an X‐ray diffractometer (XRD). The optical properties of the phosphors were studied using photoluminescence spectra and UV–visible spectroscopy. The results show that the impurities Zn 2 TiO 4 :Pr 3+ and Ca 2 Zn 4 Ti 16 O 38 :Pr 3+ significantly contributed to the enhancement of an absorption band around 380 nm. The optimum Ca 0.8 Zn 0.2 TiO 3 :Pr 3+ phosphor consisting of appropriate amounts of CaTiO 3 , Ca 2 Zn 4 Ti 16 O 38 and Zn 2 TiO 4 in three phases was achieved by controlling the hydrothermal conditions, and the obtained red phosphor exhibited the highest red emission ( 1 D 2 → 3 H 4 transition of Pr 3+ ) with an ideal chromaticity coordinate located at ( x = 0.667, y = 0.332) under 380 nm excitation.