Luminescent properties of Sr₂B₂O₅: Tm³⁺, Na⁺ blue phosphor

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• 作者：Lihan Cai ; Lili Ying ; Jianghui Zheng ; Baodian Fan ; Rong Chen ; Chao Chen ; ^{cchen@xmu.edu.cn" class="auth_mail} ; ^{chenchao0592@126.com" class="auth_mail}
• 关键词：Phosphor ; Luminescence ; Tm3+
• 刊名：Ceramics International
• 出版年：June, 2014
• 年：2014
• 卷：40
• 期：5
• 页码：6913-6918
• 全文大小：2875 K

文摘

A novel blue phosphor, Sr₂B₂O₅: Tm³⁺, Na⁺ for white light-emitting diodes (W-LEDs) was prepared by solid-state synthesis and its structure and luminescence properties were investigated. This phosphor can be effectively excited within the broad near ultraviolet (NUV) wavelength region, from 340 nm to 370 nm, and exhibits a satisfactory blue performance. The emission peaks are observed at 457 nm (blue) and 475 nm (blue), due to the respective transitions of ¹D₂鈫?sup>3F₄ and ¹G₄鈫扝₆. Seven mole percent of doping concentration of Tm³⁺ was shown to be optimal. Concentration quenching occurs when Tm³⁺ concentration is beyond 7 mol%, its mechanism being explained by dipole-dipole interaction of Tm³⁺ and being confirmed by decay property measurements. We have made a deep analysis on the effect of charge compensation reagent on luminescence intensity. Good blue emissions with the CIE chromaticity coordinates (0.173, 0.165) could be achieved. Our results suggest that the Sr₂B₂O₅: Tm³⁺, Na⁺ phosphor is a potential blue-emitting material.