Synthesis of a novel red phosphor K2xBa1-xTiF6:Mn4+ and its enhanced luminescence performance, thermal stability and waterproofness

Synthesis of a novel red phosphor K2xBa1-xTiF6:Mn4+ and its enhanced luminescence performance, thermal stability and waterproofness

Bibliographic Details
Parent link:Journal of Alloys and Compounds
Vol. 808.— 2019.— [151697, 8 p.]
Corporate Authors: Национальный исследовательский Томский политехнический университет Инженерная школа новых производственных технологий Отделение материаловедения, Национальный исследовательский Томский политехнический университет Инженерная школа новых производственных технологий
Other Authors: Fang Shuangqiang, Khan (Han) Tao, Lang Tianchun, Zhong Yang, Bitao Liu, Cao Shixiu, Lingling Peng E., Yakovlev A. N. Aleksey Nikolaevich, Korepanov V. I. Vladimir Ivanovich
Summary:Title screen
Investigation of efficient red phosphors is highly desired for the development of novel warm white light emitting diodes. In this paper, through a facile method, we first introduce K+ to replace Ba2+ to synthesize a novel K2xBa1-xTiF6:Mn4+ solid solution phosphor with high luminous efficiency, high thermal stability and good waterproofness. Significantly, compared with two best luminescence performance samples (BaTiF6:0.006Mn4+ and K0.070Ba0.965TiF6:0.018Mn4+), the luminescence intensity of K0.070Ba0.965TiF6:0.018Mn4+ is increased by 6 times, the quantum efficiency is improved from 40% to 75% and the activation energy of thermal quenching is improved to 0.940?eV from 0.628?eV. Remarkably, the waterproofness is improved by 45% than traditional red phosphor K2TiF6:Mn4+ after being immersed in water for 150?min. Moreover, a high-performance WLED with low correlated color temperature (CCT?=?3930?K), high color rendering index (Ra?=?90.3) and luminous efficacy of 105 lm/W is achieved by employing blue-emitting GaN chip, yellow-emitting YAG:Ce3+ phosphor and red-emitting K0.070Ba0.965TiF6:Mn4+ phosphor. These results reveal that introduced suitable cation may have a positive effect on luminescent properties of Mn4+ activated fluoride phosphors, which is a helpful tool for their performance improvement, and K0.070Ba0.965TiF6:Mn4+ presents a good luminescent property and may be a potential candidate for high-performance warm WLED.
Режим доступа: по договору с организацией-держателем ресурса
Published: 2019
Subjects:
электронный ресурс
труды учёных ТПУ
Mn4+
phosphor
luminescence performance
thermal stability
waterproofness
люминофоры
люминесцентные характеристики
термостойкость
водонепроницаемость
Online Access:https://doi.org/10.1016/j.jallcom.2019.151697
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=662503

Internet

https://doi.org/10.1016/j.jallcom.2019.151697

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