In order to obtain white-emitting ACEL

some researchers

[1

2]

mixed two or three kinds of ACEL material. But the results were not so good. Others

[4

5]

reported some progress of white-emitting ACEL powder using homogenenous material. In present paper

we report some new results of preparing homogenenous white-emitting ACEL powder.The conditions for preparing samples are: 1) dopant concentrations

Cu

2+

0.2% and Mn

2+

0.05%-0.2% (weight)

2)temperature of firing 850-900C; 3) time of firing

30-40min.The spectra of ZnS: Cu

Mn with different ratio of Cu/Mn under the excitation of 400Hz and 200V are shown in Fig.1. There appear three spectrum peaks at 4560Å

5260Å and 5850Å in the limited concentration range of dopants. The peaks 4650Å and 5260Å aries from the luminescent center Cu and 5850Å arises from the center Mn. We have obtained the white-emitting ACEL phosphor with coordinates

x

=0.343

y

=0.386 and the ratio of Mn/Cu=0.25. under the excitation of

f

=400Hz and 200V. The relation between brightness and excitation field is shown in Fig.2. It appears that the excitation process is collision-ionization or collision-excitation. We have also observed the relation between excitation field waveform and brightness waveform. The results are shown in Fig.3. It is clear that ACEL brightness Waveform of ZnS:Cu

Mr

is consisted of the overlap of Cu and Mn luminescence.