Patent Number: 6,169,359

Title: Electroluminescent phosphor thin films with increased brightness that includes an alkali halide

Abstract: The luminance of a phosphor suitable for an alternating current thin-film electroluminescent device is substantially improved according to the present invention by including an alkali halide. The alkali halide included within the bulk of the phosphor material results in providing a significant number of trapping states which trap free electrons within the phosphor material. The addition of the trapping states (added defects) within the bulk tend to control the electrical and optical characteristics of the phosphor material. This reduces asymmetric light output characteristics of traditional phosphor material, reduces asymmetric current movement within the phosphor material, and decreases the influence of the interfaces between the phosphor material and insulating materials resulting in decreased aging and increased brightness.

Inventors: Sun; Sey-Shing (Beaverton, OR), Holloway; Paul H. (Gainesville, FL), Davidson; Mark Rogers (Florahome, FL), Waldrip; Karen Elizabeth (Gainesville, FL), Lewis, III; John S. (Gainesville, FL), Yocom; P. Niel (Princeton, NJ)

Assignee: Planar Systems, Inc.

International Classification: C09K 11/02 (20060101); C09K 11/61 (20060101); H05B 33/14 (20060101); H01J 001/62 (); H01J 063/04 ()

Expiration Date: 01/02/2018