K7Ca9[Si2O7]4F:Ce3+: a novel blue-emitting phosphor with good thermal stability for ultraviolet-excited light emitting diodes

被引：51

作者：

Geng, Wanying ^{[1
,2
,3
]}

Zhou, Xufeng ^{[1
,2
,3
]}

Ding, Jianyan ^{[1
,2
,3
]}

Li, Gen ^{[1
,2
,3
]}

Wang, Yuhua ^{[1
,2
,3
]}

机构：

[1] Lanzhou Univ, Natl & Local Joint Engn Lab Opt Convers Mat & Tec, Natl Dev & Reform Commiss, Lanzhou 730000, Gansu, Peoples R China

[2] Lanzhou Univ, Key Lab Special Funct Mat & Struct Design, Minist Educ, Lanzhou 730000, Gansu, Peoples R China

[3] Lanzhou Univ, Sch Phys Sci & Technol, Lanzhou 730000, Gansu, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2017年 / 5卷 / 44期

关键词：

CONVERSION PHOSPHORS; OPTICAL-PROPERTIES; CRYSTAL-STRUCTURE; GREEN; PHOTOLUMINESCENCE; LUMINESCENCE; DESIGN; ENERGY;

D O I：

10.1039/c7tc02561k

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, a novel potassium-calcium silicate-fluoride based phosphor: K7Ca9[Si2O7](4)F (KCSOF) has been successfully synthesized by a solid-state reaction at low temperature. The occupation of Ce3+ is studied by Rietveld refinement, luminescence properties and decay curves. KCSOF:Ce3+ presents a wide absorption band ranging from 240 to 420 nm and displays blue emission (lambda(max) = 445 nm). Good thermal stability has also been detected, which shows that it still retains 90% of the initial intensity at 200 degrees C. In addition, a white LED device has been manufactured by connecting a 380 nm UV chip with a blend of KCSOF:Ce3+, (Sr, Ba) SiO4:Eu2+ and CaAlSiN3:Eu2+. The color coordinates, correlated color temperature and color rendering index of the manufactured LED device are (0.421, 0.407), 3256 K and 95.55, respectively. These results suggest that the blue-emitting KCSOF:Ce3+ phosphor has good prospects for applications in white UV LEDs.

引用

页码：11605 / 11613

页数：9

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