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Development of new high‐luminance green EL devices based on Eu‐doped calcium thioaluminate materials system
Author(s) -
Nakua Abdul M.,
Cheong Dan,
Wu Xingwei
Publication year - 2003
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.1825680
Subject(s) - phosphor , luminance , brightness , materials science , dopant , doping , europium , optics , optoelectronics , saturation (graph theory) , luminescence , physics , mathematics , combinatorics
— A new green EL phosphor with excellent brightness, efficiency, and color saturation was developed. This phosphor is based on the europium‐activated calcium thioaluminate materials system. The performance of this phosphor is greatly enhanced by the addition of Gd as a co‐dopant. Similarly, the addition of ZnS layers on the top and bottom of the phosphor film improved the device luminance considerably. The luminance of the EL devices can be as high as 1700 cd/m 2 with CIE color coordinates (0.190, 0.645) which were tested by using 32‐μsec‐wide square pulses with a frequency of 120 Hz. The device efficiency was over 2 lm/W.