A novel red-emitting La2CaHfO6:Mn4+ phosphor based on double perovskite structure for pc-WLEDs lighting

被引：26

作者：

Xing, Gongcheng ^{[1
]}

Feng, Yuxin ^{[1
]}

Gao, Zhiyu ^{[1
]}

Tao, Mengxuan ^{[1
]}

Wang, Hongquan ^{[1
]}

Wei, Yi ^{[1
]}

Molokeev, Maxim S. ^{[2
,3
,4
]}

Li, Guogang ^{[1
]}

机构：

[1] China Univ Geosci, Fac Mat Sci & Chem, Minist Educ, Engn Res Ctr Nanogeomat, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China

[2] FRC KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia

[3] Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia

[4] Siberian Fed Univ, Krasnoyarsk 660041, Russia

来源：

CRYSTENGCOMM | 2019年 / 21卷 / 23期

基金：

中国国家自然科学基金;

关键词：

LUMINESCENCE PROPERTIES; ELECTRONIC-STRUCTURE; OPTICAL-PROPERTIES; SITE OCCUPANCY; MN4+; IONS; TRANSITIONS; MECHANISM; PROGRESS; CE3+;

D O I：

10.1039/c9ce00556k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Non-rare earth doped oxides with red emission are one of the current research hotspots for achieving the warm white light range in the phosphor converted white light emitting diodes (pc-WLEDs) field. In the current work, a novel Mn4+-activated La2CaHfO6 red phosphor is reported for the first time and its crystal structure is analyzed by Rietveld refinement. The photoluminescent properties of La2CaHfO6: Mn4+ are investigated in detail with the help of diffuse refletance spectroscopy, photoluminescence spectroscopy, and temperature-dependent PL spectroscopy. Based on the diffuse refletance spectra, the calculated optical band gap for La2CaHfO6 is 4.9 eV, indicating that La2CaHfO6 could be a suitable host for activators' doping. Under 380 nm near-ultraviolet (n-UV) light excitation, the as-prepared La2CaHfO6: Mn4+ displays intense red emission centered at 693 nm. Through an accurate calculation of Dq/B (2.47) and nephelauxetic effect ss 1 (0.949), the origination of strong crystal field (CF) and deep-red emission is demonstrated. By combining the representative La2CaHfO6: 0.002Mn4+, blue BAM: Eu2+, and green (Ba, Sr) 2SiO4: Eu2+ phosphors with a 380 nm UV chip to fabricate the pc-WLEDs device, a white light is obtained with low correlated color temperature (CCT = 5165 K) and high color rendering index (Ra = 87.8), demonstrating that the as-prepared La2CaHfO6: Mn4+ phosphors can be used as red-emitting candidate in pc-WLEDs lighting.

引用

页码：3605 / 3612

页数：8

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