Study on A‐C Powder EL Phosphor Deterioration Factors

Abstract

It is shown that a-c powder EL deterioration is closely related to sulfur vacancy in the phosphor and the phosphor crystal quality, by measurement of ESR spectrum and x-ray diffraction pattern. The EL phosphor life is improved with a decrease in the sulfur vacancy density in the phosphor. It is further improved with a decrease in the x-ray diffraction (111) peak intensity of the phosphor. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.210.126.199 Downloaded on 2015-05-31 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.210.126.199 Downloaded on 2015-05-31 to IP Vol. 130, No. 11

A CuO Nanowire‐Based Alternating Current Oxide Powder Electroluminescent Device with High Stability

“…In ZnS:Cu, electrically conductive CuS nanoprecipitates form regions of enhanced electric fields within the ZnS and field emission and hence electroluminescence is enabled . However, the AC powder EL devices assembled with sulfide‐based phosphor materials are well known to deteriorate during continued operation . Furthermore, sulfide‐based phosphor materials are sensitive to moisture, leading to the requirement for encapsulation, which adds cost.…”

“…This remarkable stability relies on the good chemical stability of oxide phosphor powders and effective heterogeneous junctions between the phosphor particles and CuO nanowire array (Supporting Information, Figure S5). In contrast, fast degradation of luminance is a common and inevitable problem in ZnS:Cu powder‐based EL device owing to the migration of Cu atoms in Cu x S and high sensitivity to moisture in sulfide powder …”

A CuO Nanowire‐Based Alternating Current Oxide Powder Electroluminescent Device with High Stability

“…In ZnS:Cu, electrically conductive CuS nanoprecipitates form regions of enhanced electric fields within the ZnS and field emission and hence electroluminescence is enabled . However, the AC powder EL devices assembled with sulfide‐based phosphor materials are well known to deteriorate during continued operation . Furthermore, sulfide‐based phosphor materials are sensitive to moisture, leading to the requirement for encapsulation, which adds cost.…”

Alternating Current‐Driven Oxide Powder Electroluminescent Device Employing Vertically Aligned ZnO Nanowire Array

“…However, AC powder EL devices assembled with sulfidebased phosphor materials are well known to deteriorate during continued operation. [8][9][10][11][12][13] In addition, sulfide-based phosphor materials are sensitive to moisture leading to the requirement for encapsulation which adds cost. The degradation process of sulfide-based EL devices is accelerated as operating temperature increases.…”