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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.
| Язык оригинала | Английский |
|---|---|
| Номер статьи | 151697 |
| Журнал | Journal of Alloys and Compounds |
| Том | 808 |
| DOI | |
| Состояние | Опубликовано - 5 ноя 2019 |
Отпечаток
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry
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Synthesis of a novel red phosphor K2xBa1-xTiF6:Mn4+ and its enhanced luminescence performance, thermal stability and waterproofness. / Fang, Shuangqiang; Han, Tao; Lang, Tianchun; Zhong, Yang; Liu, Bitao; Cao, Shixu; Peng, Lingling; Yakovlev, Alexey N.; Korepanov, Vladimir I.
В: Journal of Alloys and Compounds, Том 808, 151697, 05.11.2019.Результат исследований: Материалы для журнала › Статья
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TY - JOUR
T1 - Synthesis of a novel red phosphor K2xBa1-xTiF6:Mn4+ and its enhanced luminescence performance, thermal stability and waterproofness
AU - Fang, Shuangqiang
AU - Han, Tao
AU - Lang, Tianchun
AU - Zhong, Yang
AU - Liu, Bitao
AU - Cao, Shixu
AU - Peng, Lingling
AU - Yakovlev, Alexey N.
AU - Korepanov, Vladimir I.
PY - 2019/11/5
Y1 - 2019/11/5
N2 - 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.
AB - 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.
KW - Luminescence performance
KW - Mn
KW - Phosphor
KW - Thermal stability
KW - Waterproofness
UR - http://www.scopus.com/inward/record.url?scp=85070360372&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85070360372&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2019.151697
DO - 10.1016/j.jallcom.2019.151697
M3 - Article
AN - SCOPUS:85070360372
VL - 808
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
M1 - 151697
ER -