Sr9Mg1.5(PO4)7:Eu2+: A Novel Broadband Orange-Yellow-Emitting Phosphor for Blue Light-Excited Warm White LEDs

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• 作者：Wenzhi Sun ; Yonglei Jia ; Ran Pang ; Haifeng Li ; Tengfei Ma ; Da Li ; Jipeng Fu ; Su Zhang ; Lihong Jiang ; Chengyu Li
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 18, 2015
• 年：2015
• 卷：7
• 期：45
• 页码：25219-25226
• 全文大小：505K
• ISSN：1944-8252

文摘

A new orange-yellow-emitting Sr₉Mg_1.5(PO₄)₇:Eu²⁺ phosphor was prepared via high-temperature solid-state reaction. The structure and optical properties of it were studied systematically. Sr₉Mg_1.5(PO₄)₇:Eu²⁺ can be well-excited by 460 nm blue InGaN chips and exhibit a wide emission band covering from 470 to 850 nm with two main peaks centered at 523 and 620 nm, respectively, which originate from 5d鈥?f dipole-allowed transitions of Eu²⁺ in different crystallographic sites. The sites attribution, concentration quenching, fluorescence decay analysis, and temperature-dependent luminescence properties were investigated in detail. Furthermore, a warm white LED device was fabricated by combining a 460 nm blue InGaN chip with the optimized orange-yellow-emitting Sr₉Mg_1.5(PO₄)₇:Eu²⁺. The color coordinate, correlated color temperature and color rendering index of the fabricated LED device were (0.393, 0.352), 3437 K, and 86.07, respectively. Sr₉Mg_1.5(PO₄)₇:Eu²⁺ has great potential to serve as an attractive candidate in the application of blue light-excited warm white LEDs.