Blue Phosphors for Full-Color High-Definition Video Display

用于全彩高清视频显示的蓝色荧光粉

• 批准号: 8961368
• 负责人: Anton Greenwald
• 金额: $ 4.99万
• 依托单位: Spire Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-01-01 至 1990-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8961368&HistoricalAwards=false
• 关键词: Blue; Phosphors; Full; Color; Definition

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.

薄膜电致发光技术现在生产的矩阵寻址自发光平板非常接近于提供高清晰度彩色电视的能力。将这项技术推进到全色视频成像的主要障碍是对高亮度、饱和蓝色荧光粉的需求。目前最有希望的候选材料是ZnS：Tm，它具有很好的色度，但亮度太低，只有1-2个数量级。它的微弱发射与其强烈的蓝色阴极发光和光致发光不一致，很可能是由于缺陷。我们将最大限度地提高作为薄膜结构函数的ZnS：TM型荧光粉的亮度；还将评估特定阴离子的最佳电荷补偿以及其他稀土元素的共同激活。在相同的大面积反应器中，原子层外延形成10-30 nm的种子层后，用传统的金属有机化学气相沉积方法生长出薄的荧光粉薄膜。由此产生的均匀的大直径柱状晶结构有望极大地提高电亮度。此外，这种沉积工艺能够在单个腔室中铺设用于全色显示的所有以硫化锌为主体的基色荧光粉，它服从于低成本的非光刻像素清晰度，并且其固有的可伸缩性。