Understanding and improving electroluminescence in mill-ground ZnS : Cu,Cl phosphors

Date

2011

Authors

Medling, Scott
France, C.
Balaban, B
Kozina, M
Jiang, Y
Bridges, F.
Carter, S.A.

Journal Title

Journal ISSN

Volume Title

Publisher

Institute of Physics Publishing

Abstract

We demonstrate that lightly milled ZnS : Cu,Cl phosphors produce AC electroluminescence (EL) emission in devices half as thick and produce up to 5 times the light output as the thinnest devices made with unground phosphors. We also establish minimum and maximum bounds on micro-milling conditions for producing powders that are still viable for AC EL. To understand the cause of the minimum size, we report extended x-ray absorption fine structure (EXAFS) measurements on phosphors sorted by particle size. The EXAFS data show that grinding preferentially damages the initially embedded CuS nano-precipitate. This suggests that grinding cleaves the ZnS : Cu through the embedded CuS nano-precipitates, leaving the CuS nano-precipitates on the surface to be further broken apart by continued grinding, eventually reducing the effectiveness of the CuS-induced electric field enhancement.

Description

Keywords

Keywords: Electric field enhancement; Electroluminescence emission; EXAFS data; Extended X-ray absorption fine structure measurements; Light output; Micro milling; Nanoprecipitates; Electric fields; Grinding (comminution); Grinding (machining); Light emission; Phos

Citation

Source

Journal of Physics D: Applied Physics

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1088/0022-3727/44/20/205402

Restricted until

2037-12-31