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Synthesis and Luminescence Properties of Rare Earth Activated Phosphors for near UV-Emitting LEDs for Efficacious Generation of White Light.

机译：用于有效产生白光的近紫外发光LED的稀土活化荧光粉的合成和发光特性。

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摘要

Solid state white-emitting lighting devices based on LEDs outperform conventional light sources in terms of lifetime, durability, and luminous efficiency. Near UV-LEDs in combination with blue-, green-, and red-emitting phosphors show superior luminescence properties over the commercialized blue-emitting LED with yellow-emitting phosphors. However, phosphor development for near UV LEDs is a challenging problem and a vibrant area of research. In addition, using the proper synthesis technique is an important consideration in the development of phosphors. In this research, efficient blue-, green-yellow, red-emitting, and color tunable phosphors for near UV LEDs based white light are identified and prepared by various synthetic methods such as solid state reaction, sol-gel/Pechini, co-precipitation, hydrothermal, combustion and spray-pyrolysis. Blue-emittingLiCaPO4:Eu2+, Green/yellow-emitting (Ba,Sr)2SiO4:Eu2+, color tunable solid solutions of KSrPO4-(Ba,Ca)2SiO4:Eu 2+, and red-emitting (Ba,Sr,Ca)3MgSi2O 8:Eu2+,Mn2+ show excellent excitation profile in the near UV region, high quantum efficiency, and good thermal stability for use in solid state lighting applications. In addition, different synthesis methods are analyzed and compared, with the goal of obtaining ideal phosphors, which should have not only have high luminous output but also optimal particle size (∼150–400 nm) and spherical morphology. For Sr2SiO 4:Eu2+, the sol-gel method appears to be the best method. For Ba2SiO4:Eu2+, the co-precipitation method is be the best. Lastly, the fabrication of core/SiO2 shell particles alleviate surface defects and improve luminescence output and moisture stability of nano and micron sized phosphors. For nano-sized Y2O 3:Eu3+, Y2SiO5:Ce3+,Tb 3+, and (Ba,Sr)2SiO4, the luminescence emission intensity of the core/shell particles were significantly higher than that of bare cores. Additionally, the moisture stability is also improved by SiO 2 shells, the luminescence output of SiO2 coated green emitting Ca3SiO4Cl2:Eu2+ and blue emitting Ca2PO4Cl:Eu2+ phosphors is comparable to that of fresh phosphors although bare phosphors shows significant luminescence quenching after water exposure.
机译：在寿命，耐用性和发光效率方面，基于LED的固态发白照明设备优于传统光源。结合了发射蓝，绿和红光的磷光体的近紫外LED优于具有发射黄光的磷光体的商业化蓝光LED。但是，用于近紫外LED的荧光粉开发是一个充满挑战的问题，也是一个充满活力的研究领域。另外，在磷光体的开发中，使用适当的合成技术是重要的考虑因素。在这项研究中，通过各种合成方法（例如固态反应，溶胶-凝胶/佩奇尼（Pechini），共沉淀），鉴定并制备了用于基于近紫外LED的白光的高效蓝，绿，黄，发红和色可调荧光粉。 ，水热，燃烧和喷雾热解。发出蓝色光的LiCaPO4：Eu2 +，发出绿色/黄色（Ba，Sr）2SiO4：Eu2 +，可调谐KSrPO4-（Ba，Ca）2SiO4：Eu 2+的固溶体和发出红色（Ba，Sr，Ca）3MgSi2O 8：Eu2 +，Mn2 +在固态照明应用中在近紫外线区域显示出出色的激发曲线，高量子效率和良好的热稳定性。另外，为了获得理想的荧光粉，分析和比较了不同的合成方法，该荧光粉不仅应具有高的发光输出，而且还应具有最佳的粒径（约150-400 nm）和球形形态。对于Sr2SiO 4：Eu2 +，溶胶-凝胶法似乎是最好的方法。对于Ba2SiO4：Eu2 +，共沉淀法是最好的。最后，核/ SiO 2壳颗粒的制造减轻了表面缺陷并改善了纳米和微米级磷光体的发光输出和湿气稳定性。对于纳米级的Y2O 3：Eu3 +，Y2SiO5：Ce3 +，Tb 3+和（Ba，Sr）2SiO4，核/壳粒子的发光强度显着高于裸核。此外，SiO 2壳还提高了水分稳定性，SiO 2包覆的发射绿色Ca3SiO4Cl2：Eu2 +和发射蓝色Ca2PO4Cl：Eu2 +磷光体的发光输出与新鲜磷光体相当，尽管裸露的磷光体在暴露于水后显示出显着的发光淬灭。

著录项

  • 作者

    Han, Jinkyu.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Chemistry Inorganic.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 226 p.
  • 总页数 226
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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