An intense red-emitting phosphor Sr₃Lu(PO₄)₃:Eu³⁺ for near ultraviolet light emitting diodes application

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• 作者：Tao Wang ; Yihua Hu ; ^{huyh@gdut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Li Chen ; Xiaojuan Wang ; Miao He
• 关键词：Luminescence ; Sr3Lu(PO4)3 ; Eu3+ ; Red phosphor
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 February 2016
• 年：2016
• 卷：42
• 期：2
• 页码：3659-3665
• 全文大小：1861 K

文摘

A series of Sr₃Lu(PO₄)₃:Eu³⁺ phosphors were successfully prepared via the solid-state method, and their luminescence properties were investigated. The excitation and emission spectra show that this phosphor can be effectively excited by near ultraviolet (NUV) light, and produces strong and prevailing red emissions at 612 nm belonging to the ⁵D₀→⁷F₂ electric dipole transition. Eu³⁺ ion was heavy doped in Sr₃Lu(PO₄)₃ host and the optimal concentration of Eu³⁺ was found as 0.8. The critical transfer distance of Eu³⁺ was determined to be 8.5 Å. The concentration quenching was demonstrated to be caused by the energy transfer among the nearest-neighbor ions in the Sr₃Lu(PO₄)₃:Eu³⁺ phosphor. Under excitation of 394 nm, the integral emission intensity of Sr₃Lu_0.2(PO₄)₃:0.8Eu³⁺ is about 6 times that of Y₂O₃:Eu³⁺. The CIE color coordinates of Sr₃Lu_0.2(PO₄)₃:0.8Eu³⁺ was (0.636, 0.354) located in red region. In addition, good thermal stability was also identified in Sr₃Lu_0.2(PO₄)₃:0.8Eu³⁺ and its emission intensity was reduced to 88% of its initial value at 100 °C and 70% at 200 °C. The current research suggests that Sr₃Lu(PO₄)₃:Eu³⁺ could be a promising red phosphor for white LEDs and display devices.