Realization of tunable emission via efficient Tb³⁺-Eu³⁺ energy transfer in K₃Gd(PO₄)₂ for UV-excited white light-emitting-diodes

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• 作者：Tingming Jiang ; Xue Yu ; Xuhui Xu ; Hongling Yu ; Dacheng Zhou ; Jianbei Qiu
• 关键词：Energy transfer ; Phosphors ; Orange-yellow ; w-LEDs
• 刊名：Optical Materials
• 出版年：January, 2014
• 年：2014
• 卷：36
• 期：3
• 页码：611-615
• 全文大小：1378 K

文摘

A n-UV convertible phosphor K₃Gd(PO₄)₂:Tb³⁺, Eu³⁺ with tunable-emitting color has been synthesized by the solid state reaction. Under the Tb³⁺ excitation (373 nm), the Eu³⁺ emissions increase dramatically with increasing the Eu³⁺ content due to the efficient energy transfer from Tb³⁺ to Eu³⁺, which has been justified through the luminescence spectra and fluorescence decay curves. K₃Gd(PO₄)₂:0.5Tb³⁺, yEu³⁺ can achieve tunable color emissions from yellowish-green through orange-yellow and ultimately to reddish-orange by simply adjusting the Eu³⁺ content. In addition, the energy transfer mechanism was demonstrated to be the dipole-dipole interaction and the energy transfer efficiency was calculated. The present results indicate that this novel orange-yellow emitting phosphor can be as a potential candidate for the application in white LEDs.