As an important material of optoelectronic devices

many questions about the luminescence of Zn

1-x

Mn

x

S had been researched clearly.The origin of additional emission bands

however

which appears in Zn

1-x

Mn

x

S only at higher amount of Mn(x≥0.01)are not yet fully explained.To counter this question

the emission spectra and decay curve of Zn

1-x

Mn

x

S at different concentrations of Mn(0.001

<

x

<

0.5)were measured and analyzed by the model of Yokota and Tanimoto.While fitting the decay curve of

4

T

1

we notice that the decay must be considered as sum of two different kinds of relaxation process:The

4

T

1

(G)decay of Mn

2+

ions determines the tail of the decay curve as these states have a rather long lifetime.The

4

T

1

(G)decay of Mn

2+

tupels(i.e.pairs of Mn

2+

ions)is much faster than that of single Mn

2+

state.We have analyzed deeply the emission spectra and its decay curve of Zn

1-x

Mn

x

S at x=0.062

T=80K

got two lifetimes:τ

1

=70μs

τ

2

=≥1000μs.The results indicate that there are two kinds of relaxation process at high concentration of Mn

one is faster

another is slower.According to the experiment result of Goede et al.we may conclude the slower precess comes from isolated Mn

2+

ions

then we may deduce there are the pairs of Mn

2+

-Mn

2+

in Zn

1-x

Mn

x

S at higher concentration of Mn and they cause the IR emission and in this system.