Blue-emitting K2Al2B2O7:Eu(2+) phosphor with high thermal stability and high color purity for near-UV-pumped white light-emitting diodes

Inorganic Chemistry
Wenge XiaoJiahua Zhang

Abstract

Novel blue-emitting K2Al2B2O7:Eu(2+) (KAB:Eu(2+)) phosphor was synthesized by solid state reaction. The crystal structural and photoluminescence (PL) properties of KAB:Eu(2+) phosphor, as well as its thermal properties of the photoluminescence, were investigated. The KAB:Eu(2+) phosphor exhibits broad excitation spectra ranging from 230 to 420 nm, and an intense asymmetric blue emission band centered at 450 nm under λex = 325 nm. Two different Eu(2+) emission centers in KAB:Eu(2+) phosphor were confirmed via their fluorescence decay lifetimes. The optimal concentration of Eu(2+) ions in K2-xEuxAl2B2O7 was determined to be x = 0.04 (2 mol %), and the corresponding concentration quenching mechanism was verified to be the electric dipole-dipole interactions. The PL intensity of the nonoptimized KAB:0.04Eu(2+) phosphor was measured to be ∼58% that of the commercial blue-emitting BaMgAl10O17:Eu(2+) phosphor, and this phosphor has high color purity with the CIE coordinate (0.147, 0.051). When heated up to 150 °C, the KAB:0.04Eu(2+) phosphor still has 82% of the initial PL intensity at room temperature, indicating its high thermal stability. These results suggest that the KAB:Eu(2+) is a promising candidate as a blue-emitting n-UV con...Continue Reading

References

Oct 21, 2011·Chemical Communications : Chem Comm·Jinying YuJiahua Zhang
Oct 18, 2012·Nature Communications·Hisayoshi DaichoHideo Hosono
Dec 19, 2013·Chemical Society Reviews·Mengmeng ShangJun Lin
Apr 29, 2014·ACS Applied Materials & Interfaces·Szu-Ping LeeTeng-Ming Chen
Jun 7, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Ruijin YuHailong Ma

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Citations

Jun 18, 2016·ACS Applied Materials & Interfaces·Xindan ZhangHaifeng Zhao
Apr 22, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Weiwei WuJianxu Hu
Mar 3, 2020·Inorganic Chemistry·Gui-Hua LiXiao-Jun Wang

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