Correlating the Charge Trap Characteristics of ACEL Phosphor Powders ZnS:Cu,X (X =Cl, Br) with Their Electroluminescence Spectra
The performance of ZnS: Cu,X (X = C1, Br, I) ACEL phosphor powders is critically dependent on the efficient injection of charge and the rates of trapping and de-trapping of these charges in the ZnS lattice, in addition to radiative recombination of the charges at luminescent Cu centres. The characterisation of the charge traps using thermoluminescence is reported and it is shown how these charge traps depend on the identities of the dopant ions and the synthetic route used in the phosphor preparation. We describe how the thermal annealing history of ACEL phosphor powders critically affects their electroluminescence performance. This is shown to be due to the dependence of the characteristics of the electron traps on the firing conditions, as is made evident from their thermally stimulated luminescence curves. As the ACEL performance of the phosphors is related to the charge baps (that are characterised by the thermoluminescence experiments) a full understanding of their origin and role is of fundamental importance if the aim is to improve phosphor performance.
ACEL Phosphor Powders Charge Traps Thermally Stimulated Luminescence
Robert Withnall Jack Silver Terry G. Ireland Paul J. Marsh George R. Fern
Wolfson Centre for Materials Processing, Brunei University,Oxbridge, Middlesex UB83PH, UK
国际会议
上海
英文
494-498
2007-03-12（万方平台首次上网日期，不代表论文的发表时间）