Structure, Luminescence, and Application of a Robust Carbidonitride Blue Phosphor (Al1-xSixCxN1-x:Eu2+) for Near UV-LED Driven Solid State Lighting

被引:75
|
作者
Wang, Le [1 ]
Wang, Xiaojun [2 ]
Takeda, Takashi [2 ]
Hirosaki, Naoto [2 ]
Tsai, Yi-Ting [3 ]
Liu, Ru-Shi [3 ,4 ,5 ]
Xie, Rong-Jun [2 ,6 ]
机构
[1] China Jiliang Univ, Coll Opt & Elect Technol, Hangzhou 310018, Zhejiang, Peoples R China
[2] Natl Inst Mat Sci, Sialon Grp, Sialon Unit, Environm & Energy Mat Div, Tsukuba, Ibaraki 3050044, Japan
[3] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan
[4] Natl Taipei Univ Technol, Dept Mech Engn, Taipei 106, Taiwan
[5] Natl Taipei Univ Technol, Grad Inst Mfg Technol, Taipei 106, Taiwan
[6] Xiamen Univ, Coll Mat, Xiamen 361005, Fujian, Peoples R China
基金
中国国家自然科学基金;
关键词
CARBONITRIDE PHOSPHORS; RAMAN-SCATTERING; SILICON; ALN; NMR; PYROLYSIS; SIALON; GAN; CERAMICS; CRYSTAL;
D O I
10.1021/acs.chemmater.5b04384
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
As an extension of nitride luminescent materials, carbidonitride phosphors are also attracting great attention due to their superior thermal stability. This paper reports a blue-emitting carbidonitride phosphor Al1-xSixCxN1-x:Eu2+ suitable for near ultraviolet (UV) light emitting diodes (LEDs), which is formulated by introducing SiC into AlN:Eu2+. With the introduction of carbon (silicon), the lattice abnormally shrinks along both a- and c-axes at low x values (x <= 0.08), due to the formation of a dense interlayer for accommodating the luminescence center Eu2+. Both of the Raman spectra and solid state NMR spectroscopy show that both Si and C are dissolved in the AIN lattice. A single blue emission band (lambda(em) = 472-477 nm) is observed for compositions of x > 0.05 by cathodoluminescence measurements. Under the 365 um excitation, the maximum luminescence is attained for the composition of x = 0.06 that has an external quantum efficiency of 61% and absorption efficiency of 74.4%, which is about 11-15% higher than the corresponding carbon-free nitride sample. The thermal quenching of Al1-xSixCxN1-x:Eu2+ reduces with increasing C (SiC) content, and the sample of x = 0.06 shows a small loss of similar to 4.0% in quantum efficiency even at 200 degrees C. Using this phosphor in a near UV-driven white LED, a superhigh color rendering index of Ra = 95.3 and R9 = 72 as well as a color temperature of 3533 K are achieved.
引用
收藏
页码:8457 / 8466
页数:10
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