Birch, Stewart, Kolasch & Birch
Method of manufacturing an electroluminescent device
 Disclosed is an electroluminescent device including a substrate and an electroluminescent film on the substrate wherein the electroluminescent film is composed of a II-VI group compound semiconductor matrix and an electroluminescent center element; the improvement being present in that the electroluminescent film has a crystal structure of a hexagonal system, and contains the electroluminescent center element in a concentration (Ci) of 0.5 to 4 at. % within a thickness of 0.2 micrometer from the side of the substrate and in a concentration (Cr) of 0.15 to 0.7 at. % at the residual portion, and Ci is larger than Cr, and the process for preparing the same. 
Sharp Kabushiki Kaisha
Y C C H H
Y10S C09K C09K H05B H05B
additional inventional inventional inventional inventional
Kouji Masaru Akiyoshi Shigeo Kousuke Koichi
Taniguchi Yoshida Mikami Nakajima Terada Tanaka