Emerging ultra-narrow-band cyan-emitting phosphor for white LEDs with enhanced color rendition

被引:440
作者
Zhao, Ming [1 ]
Liao, Hongxu [1 ]
Molokeev, Maxim S. [2 ,3 ,4 ]
Zhou, Yayun [5 ,6 ]
Zhang, Qinyuan [5 ,6 ]
Liu, Quanlin [1 ]
Xia, Zhiguo [1 ,5 ,6 ]
机构
[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China
[2] Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia
[3] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[4] Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia
[5] South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510641, Guangdong, Peoples R China
[6] South China Univ Technol, Guangdong Prov Key Lab Fiber Laser Mat & Appl Tec, Guangzhou 510641, Guangdong, Peoples R China
基金
俄罗斯基础研究基金会;
关键词
LUMINESCENCE PROPERTIES; TEMPERATURE; ROUTE;
D O I
10.1038/s41377-019-0148-8
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Phosphor-converted white LEDs rely on combining a blue-emitting InGaN chip with yellow and red-emitting luminescent materials. The discovery of cyan-emitting (470-500 nm) phosphors is a challenge to compensate for the spectral gap and produce full-spectrum white light. Na0.5K0.5Li3SiO4: Eu2+ (NKLSO: Eu2+) phosphor was developed with impressive properties, providing cyan emission at 486 nm with a narrow full width at half maximum (FWHM) of only 20.7 nm, and good thermal stability with an integrated emission loss of only 7% at 150 degrees C. The ultra-narrow-band cyan emission results from the high-symmetry cation sites, leading to almost ideal cubic coordination for UCr4C4-type compounds. NKLSO: Eu2+ phosphor allows the valley between the blue and yellow emission peaks in the white LED device to be filled, and the color-rendering index can be enhanced from 86 to 95.2, suggesting great applications in full-spectrum white LEDs.
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页数:9
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