Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 6, pp. 843−848.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © V.V. Bakhmet’ev, K.A. Ogurtsov, M.M. Sychov, A.A. Kotomin, S.A. Dushenoka, A.S. Kozlov, Gu Xu, 2012, published in Zhurnal
Prikladnoi Khimii, 2012, Vol. 85, No. 6, pp. 849−855.
AND INDUSTRIAL INORGANIC CHEMISTRY
Effect of Shock-Wave Treatment of Zinc Sulﬁ de
on Properties of ZnS:Cu,Mn Phosphor
V. V. Bakhmet’ev
, K. A. Ogurtsov
, M. M. Sychov
, A. A. Kotomin
S. A. Dushenok
, A. S. Kozlov
, and Gu Xu
St. Petersburg State Institute of Technology, St. Petersburg, Russia
McMaster University, Hamilton, Ontario, Canada
Received October 13, 2011
Abstract—Method was developed for raising the brightness of photo- and electroluminescence from ZnS:Cu,Mn
phosphor in dc and ac ﬁ elds by preliminary shock-wave treatment of a starting zinc sulﬁ de placed in a closed
Electroluminescent phosphors (ELPs) based on zinc
sulﬁ de doped with copper and manganese are used in
light sources operating under dc or ac excitation. A
speciﬁ c feature of the ELP of composition ZnS:Cu,Mn is
that the emission color can be varied from blue to orange.
This can be done both when synthesizing a phosphor
and with an already ﬁ nished light source by changing
the frequency of the exciting voltage. In some cases,
white emission can be obtained. At present, application
of electroluminescent sources of light is hindered by
the insufﬁ cient brightness and stability of ELPs. To
make higher the emission brightness, it is necessary to
raise the concentration of activators in ELP particles;
however, the maximum concentration is restricted by
the solubility limit of copper and manganese in zinc
sulﬁ de. If, for example, the solubility limit of copper
is exceeded, the CuxS phase is formed within ELP
particles and on their surface. In minor amounts, this
phase is necessary as a source of electrons in excitation
of luminescence by an electric ﬁ eld. However, its excess
diminishes the brightness of electroluminescence (EL)
because of the shunting effect and absorption of emitted
light. Therefore, it is impossible to make larger the
number of emission centers to above a certain limit
by merely raising the activator concentration; for this
purpose, the solubility of copper and manganese in zinc
sulﬁ de should be raised.
Previously, various methods for modiﬁ cation of zinc
sulﬁ de in order to raise the solubility of activators in
this compound have been studied: treatment of ZnS with
fast electrons, plasma, and gamma rays, which provided
a substantial increase in the EL brightness [1–6].
The main problem in application of an explosive
treatment to ZnS modiﬁ cation [7–9] is that difﬁ culties are
encountered in development of the technological process
and the results are insufﬁ ciently stable. For example,
it has been reported [10, 11] that the EL brightness is
substantially raised when a stock is treated in a vacuum
chamber by exploding TNT scattered over the stock.
In , an attempt was made to reproduce these results.
However, when the recommended conditions were
closely reproduced, TNT burned without exploding.
Therefore, another method for using the explosion energy
between the stages of phosphor synthesis and annealing
was suggested in the same study . The powder was
treated in preservation ampoules ejected into a massive
object, and this procedure provided a rise in brightness.
However, it is rather technologically difﬁ cult to perform
a treatment of this kind and its conditions will be hardly
reproducible, and the output capacity, low.
In this study, we suggested a more technologically