Stable and chromaticity-tunable phosphor-in-glass inorganic color converter for high-power warm white light-emitting diode

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• 作者：Jiasong Zhong ; Daqin Chen ; ^{dqchen@hdu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yang Zhou ; Zhongyi Wan ; Mingye Ding ; Zhenguo Ji
• 关键词：White light-emitting diodes ; Phosphor in glass ; Electroluminescence ; Optical materials ; La2Ti2O7.
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：36
• 期：7
• 页码：1705-1713
• 全文大小：2505 K

文摘

White light-emitting diodes (w-LEDs) have captured much attention due to their superior properties of high luminous efficiency, low energy consumption and long lifetime. However, current white lighting devices suffer from several drawbacks such as the deficiency of red component and the poor thermal stability of silicone. In this work, a chromaticity-tunable phosphor-in-glass (PiG) inorganic color converter has been successfully fabricated for high-power warm w-LEDs. At first, a series of La_2(1−x)Eu_2xTi₂O₇ (x = 0.05–0.5) red phosphors with excellent thermal stability and high quantum efficiency have been synthesized. Importantly, the as-synthesized La₂Ti₂O₇:Eu³⁺ and commercial YAG:Ce³⁺ phosphors were incorporated into a specially low-melting precursor glass to form PiG composite. Finally, the high-power warm w-LEDs were constructed by coupling a PiG plate on an InGaN blue chip, and the w-LED showed an optimal luminous efficacy of 105 lm/W, a CCT of 4809 K and a CRI of 83.5.