Citation: XIE Rongjun, ZHOU Tianliang, TAKAHAHIS Kohei, HIROSAKI Naoto. Beta-Sialon(Si_6-zAl_zO_zN_8-z):Eu²⁺: A Promising Narrow-band Green Phosphor for Light-emitting Diode Backlights[J]. Chinese Journal of Applied Chemistry, ;2016, 33(8): 855-866. doi: 10.11944/j.issn.1000-0518.2016.08.160240 shu

Beta-Sialon(Si_6-zAl_zO_zN_8-z):Eu²⁺: A Promising Narrow-band Green Phosphor for Light-emitting Diode Backlights

1.
a College of Materials, Xiamen University, Xiamen, Fujian 316005, China;
2.
b Sialon Group, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan

Corresponding author: XIE Rongjun,
Received Date: 7 June 2016
Available Online: 23 June 2016
Fund Project:

GaN-based white light-emitting diode(LED) is now an emerging backlight technology for large color gamut and high efficiency liquid crystal displays. In this technology, phosphors are key materials to control the color-space coverage, luminous efficiency, and lifetime of the backlight units, which are required to have a desired emission and a narrow emission band. β-Sialon:Eu²⁺(sialon:silicon aluminum oxynitride, Si_6-zAl_zO_zN_8-z) is such a green phosphor because it has an emission band centered at 525~545 nm and a small band width(~55 nm). This contribution overviews the synthesis, luminescence, electronic and crystal structure, reliability and applications of β-sialon:Eu²⁺. From both structure calculations and experimental observations, Eu²⁺ is seen to be accommodated into a large void along the c-axis, and coordinated to six nitrogen/oxygen atoms at an equivalent distance. The narrow emission band is thus ascribed to the high symmetry of the local structure of Eu²⁺. Both of the emission band and the band width of β-sialon:Eu²⁺ can be tuned by tailoring the composition(e.g., the z value), and β-sialon:Eu²⁺ with shorter wavelengths and narrower bands can be achieved at lower z values. Combined with other red phosphors, β-sialon:Eu²⁺ enables to produce wider color gamut backlights(15% up) than the conventional yttrium aluminum garnet(YAG)-based ones. Both the excellent luminescence properties and reliability make β-sialon:Eu²⁺ to be an extremely important green phosphor for use in advanced displays.
- rare earth,
- nitride,
- beta-sialon:Eu²⁺,
- phosphor,
- electronic structure,
- light-emitting diode,
- backlighting
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Beta-Sialon(Si6-zAlzOzN8-z):Eu2+: A Promising Narrow-band Green Phosphor for Light-emitting Diode Backlights

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通讯作者: 陈斌, bchen63@163.com

Beta-Sialon(Si_6-zAl_zO_zN_8-z):Eu²⁺: A Promising Narrow-band Green Phosphor for Light-emitting Diode Backlights