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The determination of absolute luminescence quantum efficiency (QE) of ions in solids is important in both technology and basic physics. The photoacoustic spectroscopy (PAS) has been used quite successfully to obtain accurate absolute radiative quantum efficiency in solids because it does not require absolute calibra tion of the detector or knowledge of absolute ion concentration [1, 2]. Firstly, the PAS method was applied to highly absorbing materials even exhibiting concentration quenching of luminescence. In II-VI compounds for the first time this method was used by Ohba et al. [3] who have determined the luminescence quantum efficiency of Mn 2+ in ZnS highly doped with Mn using the gas cell PAS method. It is well known that all wide band gap II-IV compounds with low amount of Mn show the yellow emission due to the internal transition 4Τ1(G)-6Α1(S). In order to measure QE in ZnS with low Mn concentration Goede et al. [4] applied the transducer PZT (piezoelectric transducer) method which enables one to measure the structured PΑ spectra. In this paper we describe the first determination of QE of ZnSeMn with low concentration (nΜn = 0.02 mol%). The samples used in our investigations were single crystals of ZnSe doped with Mn grown by high pressure Bridgmann method. For growing the Koch—Light 6N ZnSe powder has been used. The excitation spectra were obtained by visible lines of an Ar+ laser (458 to 514 nm) at 300 K and 77 K. The gated photon counting system (Stanford SR 400) measured the intensity of the signal by counting the number of photons which were detected by a Hamamatsu R94302 photomultiplier in a given time gate.

Luminescence Quantum Efficiency of Mn2+States in ZnSe:Mn as Studied by means of Photoacoustic Spectroscopy

Luminescence Quantum Efficiency of Mn²⁺States in ZnSe:Mn as Studied by means of Photoacoustic Spectroscopy