Room temperature visible luminescence in wide band gap chalcogenide glasses

Visible photoluminescence (PL) was observed in binary g-As
₂
S
₃
, technologically modified g-GeS
₂
(T
_i
V
_j
) and ternary glasses along (As
₂
S
₃
)x(GeS
₂
)
_1-x
line. PL maximum in g-As
₂
S
₃
at 2.43 eV was assigned to band-to-band transitions and its position is in good agreement with value of optical band-gap edge absorption (E
_o
=2.4 eV). It is suggested that the peak at 2.2-2.3 eV in g-GeS
₂
(T
_i
V
_j
) and GeS
₂
-based ternary glasses may be attributed to presence of GeO
_x
species. Complex PL peak at 2.6-2.7 eV in GeS
₂
-based glasses was identified with germanium sulfur sites.