A Highly Efficient White Light (Sr3,Ca,Ba)(PO4)3Cl:Eu2+, Tb3+, Mn2+ Phosphor via Dual Energy Transfers for White Light-Emitting Diodes

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• 作者：Xi Chen ; Pengpeng Dai ; Xintong Zhang ; Cong Li ; Shan Lu ; Xiuli Wang ; Yan Jia ; Yichun Liu
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：April 7, 2014
• 年：2014
• 卷：53
• 期：7
• 页码：3441-3448
• 全文大小：490K
• 年卷期：v.53,no.7(April 7, 2014)
• ISSN：1520-510X

文摘

A series of single-phased (Sr_3鈥?i>x,Ca_{1鈥?i>y鈥?i>z},Ba)(PO₄)₃Cl (SCBPO_Cl):xEu²⁺, yTb³⁺, zMn²⁺ phosphors were synthesized by high-temperature solid-state reaction, and luminescent properties of these phosphors were investigated by means of photoluminescence and microcathode luminescence (渭-CL). Under UV excitation, white-light emission was obtained from triactivated SCBPO_Cl phosphors via combining three emission bands centered at 450, 543, and 570 nm contributed by Eu²⁺, Tb³⁺, and Mn²⁺, respectively. White-light emission with the three emission bands is further demonstrated in the fluorescence microscope images, CL spectrum, and 渭-CL mappings, which strongly confirm that the luminescence distribution of as-prepared SCBPO_Cl:xEu²⁺, yTb³⁺, zMn²⁺ phosphors is very homogeneous. Both spectral overlapping and lifetime decay analyses suggest that dual energy transfers, that is, Eu²⁺鈫扵b³⁺ and Eu²⁺鈫扢n²⁺, play key roles in obtaining the white emission. The International Commission on Illumination value of white emission as well as luminescence quantum yield (51.2鈥?1.4%) can be tuned by precisely controlling the content of Eu²⁺, Tb³⁺, and Mn²⁺. These results suggest that this single-phased SCBPO_Cl:xEu²⁺, yTb³⁺, zMn²⁺ phosphor may have a potential application as a near-UV convertible white-light emission phosphor for phosphor-converted white light-emitting diode.