Blue Phosphors for Thin Film Electroluminescent Displays

薄膜电致发光 显示技术现在产生 矩阵寻址自发光平板 这些面板非常接近 提供高性能的 清晰度彩色电视 的 推进这一进程的主要障碍 全彩色视频技术 成像是需要一个高 亮度，饱和蓝色荧光粉。 第一阶段的目标是展示 该亮蓝色EL磷光体可以 由化学蒸汽产生 沉积（CVD）硫化锌。 离子 植入用于引入 许多不同的激活元素 ZnS衬底上。 蓝色 光致发光被发现从Tm- 植入ZnS;然而， 其他离子注入组合 元素给了更强的 发光和深蓝色。 卢瑟福背散射分析 和X射线衍射表明， ZnS离子注入CVD薄膜 具有良好的化学计量， 用于TFEL器件的结构， 将被制造和测试， 第二阶段。 Spire建议第二阶段 离子继续研究 注入蓝光电致发光 磷光体。 TFEL结构将 由CVD生长的ZnS薄 电影，植入了新的蓝色- 发射掺杂剂和共掺杂剂， 植入对照激活剂 例如Mn和Tm，并评估 EL亮度、色度和 持久性。 一些优化 工艺和器件制造 将进行参数。 离子注入TFEL器件具有 低成本的巨大潜力 三色显示器，因为所有 磷光体颜色可以形成在 相同的薄膜基板。

Thin film electroluminescent (TFEL) display technology now produces matrix-addressed self-luminous flat panels which come very close to providing the capability for high- definition color television. The principal obstacle to advancing this technology to full color video imaging is the need for a high brightness, saturated-blue phosphor. The objective of Phase I was to show that bright blue EL phosphor can be produced from chemical vapor deposited (CVD) zinc sulfide. Ion implantation was used to introduce many different activator elements into ZnS substrates. Blue photoluminescence was found from Tm- implanted ZnS; however, a combination of other ion implanted elements gave much stronger luminescence and a deep blue color. Rutherford backscattering analysis and X-ray diffraction indicate that ion implanted CVD thin films of ZnS have favorable stoichiometry and structure for TFEL devices, which will be fabricated and tested in Phase II. Spire proposes for Phase II to continue investigation of ion implanted blue electroluminescent phosphors. TFEL structures will be fabricated from CVD-grown ZnS thin films, implanted with the new blue- emitting dopants and co-dopants, implanted with control activators such as Mn and Tm, and evaluated for EL brightness, chromaticity and persistence. Some optimization of process and device fabrication parameters will be conducted. Ion implanted TFEL devices have enormous potential for low-cost three-color displays because all phosphor colors can be formed in the same thin film substrate.