Download e-book for kindle: Luminescence Centers in Crystals by V. B. Neustruev (auth.), N. G. Basov (eds.)

By V. B. Neustruev (auth.), N. G. Basov (eds.)

ISBN-10: 1468488848

ISBN-13: 9781468488845

ISBN-10: 1468488864

ISBN-13: 9781468488869

This choice of papers describes investigations of luminescence facilities in II-VI crystal phosphors, ruby, and molecular crystals. those investigations have been performed utilizing spec­ troscopy in quite a lot of wavelengths, electron paramagnetic resonance, and polarization equipment. the connection among the thermal and optical depths of electron traps is con­ sidered particularly. The articles during this assortment can be of curiosity to all scientists investigating the luminescence of solids. v CONTENTS research of the Spectral-Luminescence houses of Ruby as lively Laser Medium V. B. Neustruev advent ••••. ••• 1 bankruptcy I. Spectral Distribution of Luminescence Quantum potency and Absorption Spectra . ••. " • • • • . • • • • • • • . • • • • • • • • • • • • • • • • • • • • • • • five bankruptcy II. Phosphorescence of Ruby. power Band Scheme. • • • . • • • . • . • • • • • 12 bankruptcy III. colour facilities in Ruby. • • • . • • • • • • • • • • • • • • • • • • • • • • • • • • • . sixteen bankruptcy IV.

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The other factor, also associated with the formation of color centers, was the influence of the spectrum of the Cr 3+ ions, which was manifested by a reduction in the quantum efficiency in the case of resonance excitation of y -ray-irradiated and optically colored crystals (Fig. 7). The observed fall in T) (R) could not be attributed to the inactive additional absorption in the region of the luminescence spectrum, and one had to assume that the excitation was transferred from Cr 3+ to color centers or that the probabilities of some of the transitions in the Cr 3+ ions changed in the presence of color centers.

G. Cohen and N. Bloembergen, Phys. , 135:A950 (1964). A. A. Kaplyanskii and V. N. Medvedev, Fiz. Tverd. Tela, 9:2704 (1967). G. Burns and M. I. Nathan, J. Appl. , 34:703 (1963). RELATIONSHIP BETWEEN OPTICAL AND THERMAL DEPTHS OF ELECTRON TRAPS Wu Kuang and M. V. Fok A method is suggested for the determination of the optical depth of electron traps from the position of the exponential part of the decay curve of the flash sensitivity of a phosphor, considered as a function of the energy of infrared radiation used to illuminate the phosphor.

The corresponding probabilities are given alongside the arrows. The horizontal lines represent trap levels. The trap concentrations are given on the right of each horizontal line and the densities of localized electrons (in the case of electron traps) or holes (in the case of hole traps) are given on the left of each line. the book of Antonov-Romanovskii [4]. We shall express this system in a somewhat more general form so as to clarify later the restrictions which are made: dn. cd- = GiU - (Vi dn; , dN- q ~ " dt = Gju+ (Vj dt = LJ Wini - , ni) N- - Wini - ~iN+ni nj) U- i=l N+ - , wjnj - q ~ LJ cri (Vi - q i=l (j = 1,2, ...

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Luminescence Centers in Crystals by V. B. Neustruev (auth.), N. G. Basov (eds.)


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