Blue Phosphors for Full-Color High-Definition Video Display

薄膜电致发光技术 生产矩阵寻址自发光平板 它非常接近于提供 高清彩色电视 校长 将这项技术推向全彩色的障碍 视频成像需要高亮度， 饱和蓝色磷光体。 最有前途的 可用的候选物是ZnS：Tm，其具有优异的 色度但亮度太低1-2 数量级。 其微弱的辐射是 与其强烈的蓝色不一致 阴极射线发光和光致发光， 很可能是因为缺陷 我们将最大限度地 ZnS：Tm型磷光体的亮度作为 薄膜结构;最佳电荷补偿， 特定阴离子和其他镧系元素的共活化 也将被评估。 薄的磷光体薄膜将是 通过常规金属有机化学气相生长 在形成10-30 nm晶种层之后进行沉积， 原子层外延在同一个大面积的反应器。 一个统一的大- 直径柱状晶粒结构， 大大提高电致发光。 此外，这 沉积过程能够放下所有的 用于全色显示器的ZnS主磷光体 一个单一的腔室，它是经得起成本较低的非- 像素定义，它本质上是 可扩展的

Thin-film electroluminescent 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 high-brightness, saturated-blue phosphor. The most promising available candidate is ZnS:Tm, which has excellent chromaticity but luminance that is too low by 1-2 orders of magnitude. Its weak emission is inconsistent with its intense blue cathodoluminescence and photoluminescence and is due, most likely, to defects. We will maximize the luminance of ZnS:Tm-type phosphors as a function of film structure; optimal charge compensation by specific anions and co-activation by other lanthanides will also be assessed. Thin phosphor films will be grown by conventional metalorganic chemical vapor deposition after a 10-30 nm seed layer is formed by atomic layer epitaxy in the same large-area reactor. The resultant establishment of a uniform large- diameter columnar grain structure is expected to greatly increase electroluminance. Further, this deposition process is capable of laying down all of the primary ZnS-host phosphors for full-color display in a single chamber, it is amenable to lower-cost non- photolithographic pixel definition, and it is inherently scalable.