Performance of white light emitting diodes prepared by casting wavelength-converting polymer on InGaN devices
Performance of white light emitting diodes prepared by casting wavelength-converting polymer on InGaN devices
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DOI：
10.1002/app.45210
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发表时间：
2017-09-10
影响因子：
3
通讯作者：
Chang, Shinn-Jen
中科院分区：
文献类型：
--
作者：
Chang, Chi-Jung;Leong, Yun-Yi;Chang, Shinn-Jen
使用通过氢化硅烷化反应制备的UV可固化硅氧烷低聚物作为包封剂。合成了两种发射范围涵盖绿色和红色的荧光共聚物，并与紫外光固化硅氧烷低聚物和光引发剂共混，制备了波长转换聚合物（WCP）。将WCP浇铸在蓝色发光InGaN二极管上并进行紫外线固化以制造白色发光二极管（WLED）。研究了单体组成对未固化低聚物流动性的影响，以及固化后聚硅氧烷的光学、热学和力学性能。我们还研究了由二辛基芴、双噻吩基苯并噻二唑和苯并噻二唑链段重复单元组成的红色荧光聚合物对WLED的显色指数、相关色温和发光效率的影响。由于荧光共聚物中链段的吸收和发射特征之间的良好匹配，可以通过可以支持不完全能量转移的荧光共聚物共混物来生产白色LED。(c)2017年Wiley Periodicals，Inc. J.应用聚合物Sci. 2017，134，45210。
UV-curable siloxane oligomers prepared by a hydrosilylation reaction were used as encapsulant. Two fluorescent copolymers with emission covering the range of green and red light were synthesized and blended with the UV-curable siloxane oligomers and photoinitiator to make the wavelength-converting polymer (WCP). WCP was casted on blue light emitting InGaN diodes and UV cured to fabricate white light emitting diodes (WLEDs). Effects of monomer compositions on the fluidity of uncured oligomer, together with the optical, thermal, and mechanical properties of the cured polysiloxane were studied. We also investigated the influence of red fluorescent polymer which was comprised of repeating units of dioctylfluorene, bisthienyl-benzothiadiazole, and benzothiadiazole segments on the color rendering index, correlated color temperature, and luminous efficacy of WLED. Because of the good match between the absorption and emission features of the segments in the fluorescent copolymers, white LEDs can be produced by fluorescent copolymer blends which can support incomplete energy transfer. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45210.