Computational evolutionary optimization of red phosphor for use in tricolor white LEDs
Computational evolutionary optimization of red phosphor for use in tricolor white LEDs
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DOI：
10.1021/cm052179o
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发表时间：
2006-04-04
影响因子：
8.6
通讯作者：
Kim, JS
中科院分区：
文献类型：
--
作者：
Sohn, KS;Park, DH;Kim, JS
采用遗传算法和组合化学相结合的进化优化方法，研制了适合三色白光二极管使用的钛酸盐基红色荧光粉。根据发光效率筛选了包括（K,Li,Na）(x)(Y,Gd,La,Eu)(Y)TizO δ的八阳离子氧化物体系。遗传算法和组合化学的结合使用提高了搜索效率，因为它适用于在有限的组成空间中筛选荧光粉。结果表明，最佳配比为（Na0.92Li0.08）（Y0.8Gd0.2）TiO4:Eu3+ 31，采用常规固相反应法可达到重现性。利用（Na0.92Li0.08）（Y0.8Gd0.2）TiO4:Eu3+荧光粉和InGaN芯片，实现了红色LED，从而证实了该荧光粉在白光LED中的适用性。在400 nm激发下，该荧光粉的发光强度是白钨矿变体荧光粉的110%，是市售Y2O2S:Eu3+的600%。
An evolutionary optimization process involving a genetic algorithm and combinatorial chemistry was employed in an attempt to develop titanate-based red phosphors suitable for use in tricolor white light-emitting diodes. An eight-cation oxide system, including (K,Li,Na)(x)(Y,Gd,La,Eu)(y)TizO delta, was screened in terms of luminescence efficiency. The use of a combination of a genetic algorithm and combinatorial chemistry enhanced the efficiency of searching, as it is applied to the screening of phosphors in a limited composition space. As a result, the optimum composition was determined to be (Na0.92Li0.08)(Y0.8Gd0.2)TiO4:Eu3+ 31, the reproducibility of which was achieved by the conventional solid-state reaction method. Using the (Na0.92Li0.08)(Y0.8Gd0.2)TiO4:Eu3+ phosphor and an InGaN chip, a red LED was realized, so that the applicability of this new phosphor to white LEDs was confirmed. The luminescence of this phosphor was 110% that of the well-known scheelite variant phosphor and 600% that of a commercially available Y2O2S:Eu3+ at an excitation of 400 nm.