Improved phase stability of the metastable K2GeF6:Mn4+ phosphors with high thermal stability and water-proof property by cation substitution

Improved phase stability of the metastable K2GeF6:Mn4+ phosphors with high thermal stability and water-proof property by cation substitution

Bibliographic Details
Parent link:Chemical Engineering Journal
Vol. 380.— 2020.— [122429, 7 p.]
Corporate Author: Национальный исследовательский Томский политехнический университет Инженерная школа новых производственных технологий Отделение материаловедения
Other Authors: Lang Tianchun, Khan Tao, Fang Shuangqiang, Wang Qunyi, Cao Shixiu, Peng Lingling, Liu Bitao, Korepanov V. I. Vladimir Ivanovich, Yakovlev A. N. Aleksey Nikolaevich
Summary:Title screen
K2GeF6:Mn4+ (KGFM) phosphors with very poor water-proof property in HF solution transform automatically from P63mc hexagonal phase to P3¯m1 trigonal phase. By substituting Ge4+ ion with Si4+ ion, the metastable P63mc hexagonal K2(Ge1-xSix)F6:Mn4+ (KGSFM) with an obvious zero-phonon line peaking at 623.8 nm is stabilized in HF solution. When x = 0.3, the photoluminescence intensity of KGSFM keeps 78% after 168 h in water as well as it increases by 14% at 150 °C (423 K) more than that of KGFM. By using KGSFM the fabricated WLEDs exhibit the high color-rendering index (Ra=92) and low correlated color temperature (CCT=3810 K). These results demonstrate that KGSFM solid solution with efficient red emission, meritorious water-proof and high thermal stability is a promising phosphor for the commercial application in the WLEDs and wide-gamut displays.
Режим доступа: по договору с организацией-держателем ресурса
Published: 2020
Subjects:
электронный ресурс
труды учёных ТПУ
K2GeF6:Mn4+
metastable phase
red phosphor
high thermal stability
water-proof
метастабильные фазы
люминофоры
термостойкость
водонепроницаемость
Online Access:https://doi.org/10.1016/j.cej.2019.122429
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=665309

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