Visible photoluminescence from chain Tl₄In₃GaSe₈semiconductor

Abstract

The emission band spectra of undoped Tl 4 In 3 GaSe 8 chain crystals have been studied in the 16-300 K temperature range and the 535-740 nm wavelength range. Two visible photoluminescence bands centred at 589 and 633 nm were observed at T = 16 K. Variations of both bands have been investigated over a wide range of laser excitation intensity (3 × 10 −4 -1.2 W cm −2 ). Radiative transitions with energies of 2.10 and 1.96 eV from two upper conduction bands to two shallow acceptor levels (0.03 and 0.01 eV), respectively, were suggested as being responsible for the observed bands in Tl 4 In 3 GaSe 8 crystal, which is non-transparent in the visible range.

Spectral and conductivity features of novel ternary Tl1–xIn1–xSnxS2 crystals

“…The studies of ternary thallium‐containing complex chalcogenide crystals presents a new challenge for modern infrareds laser technique . Among the large number of the such kind of crystals particular interest present the thallium containing ternary compounds in patricianly in the form of crystals.…”

Photoluminescent properties of semiconducting Tl6I4Se

“…Chalcogenide TlGaSe 2 is one of the most widely studied compounds and its electrical and optical properties have been reported [4][5][6]. Furthermore, the optical properties of the quaternary Tl chalcogenide compounds including Tl 2 Ga 2 InSe 4 [7] and Tl 4 In 3 GaSe 8 have been measured [8]. These compounds have PL emissions around 2.0 eV at low temperature.…”