Optical spectra of aggregate centres in KCl:Pb crystals

Mărculescu, L.

doi:10.1002/pssb.2220770136

Physica Status Solidi (b)

1976

DOI: 10.1002/pssb.2220770136

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Optical spectra of aggregate centres in KCl:Pb crystals

L. Mărculescu

Abstract: Absorption and emission spectra of the Pb2+ ion-cation vacancy complexes are measured. The existence of two emission bands due to aggregate centres and their shift t o lower energies are explained using a model of Pb2+ luminescent centres in the framework of Johnson and Williams' thermodynamical theory. On a mesure les spectres d'absorption et d'6mission des centres d'agr6gation Pb2+-vacance cationique. L'existence des deux bandes d'hmission produite par les centres-agrhgats et leur d6placement vers les basses… Show more

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Cited by 17 publications

References 10 publications

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On the luminescence of Sn in MaCl crystals

Rculescu

Ghiţă

Mihuţ

1980

Phys. Stat. Sol. (a)

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on the occasion of his 75th birthdayThe optical spectra of tin-doped NaCl crystals are investigated. Special attention is paid to the effects of concentration and thermal history of the crystals. Within aggregates the SnZ+ cation exhibits characteristic absorption and emission bands. The experimental data show that the tin ions present a double band emission specific for each of the dispersion states of the impurity in the crystal.On prksente les spectres optiques obtenus pour les cristaux de NaCl dop6s a11 Sn, en poursuivant spkcialement les effcts de concentration et du traitement thermique. Lc cation Sn2+ appartenant aux agrkgats montre des bandes d'absorption e t d'kmission charactkristiques. Les rksultats expkrimentaux indiquent clue les ions de Sn prksentent deux bandes d'6mission spkcifiques pour chaquo ktat de dispersion de l'impuretk dans Ie cristal.

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On the luminescence of Sn in MaCl crystals

Rculescu

Ghiţă

Mihuţ

1980

Phys. Stat. Sol. (a)

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Optical properties of NaI:Pb single crystals

Baltog

Mřculescu

Mihuţ

et al. 1980

Phys. Stat. Sol. (a)

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Absorption and emission spectra are investigated, as well as the luminescence decay for NaI crystals doped with Pb a t different concentrations and subjected to various thermal treatments. The evolution of the optical spectra after thermal treatment is associated with different dispersion states of the divalent cation impurity in the NaI matrix. After UV irradiation, the Na1:Pb crystals in the precipitation state of the impurity show photosensitivity similar to t.hat observed in U V irradiated PbI, crystals.Les spectres d'absorption et d'kmission, ainsi que I'extinction de la luminescence pour les monocristanx de NaI dopks au I'b, sont ctudibs 8, diffbrentes concentrations e t pour divers traitcments thermiques. L'kvolution des spectres optiques apr6s le traitement thermique est associke aux diffkrents ktats de dispersion de l'impureti? bivalente cationique dans la matrice de NaI. Apr& irradiation UV, les monocristaux de XaI: I'b dans 1'6tat de precipitation de I'impuretk, montre une photosensibilitb, similaire a celle observee dans les cristaux de PbI, irradiks It I'UV.

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Spectral and time decay analysis of photoluminescence excited in the A band region in KCl:Pb

Benci

Capelletti

Fermi

et al. 1978

Physica Status Solidi (b)

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The A band spectral region in KCI: Pb is studied from the point of view of the optical absorption spectra, photoluminescence (emission and excitation) spectra, and the luminescence lifetime measurements in the temperature range 15 to 320 K. The sensitive ITC technique is exploited as a parallel tool to monitor and check the solution state of the impurity in order to rule out the additional and unwanted complications arising from the presence of aggregates. As a consequence only very dilute (4 to 6 ppm) and quenched samples are chosen to perform the detailed and systematic analysis of the photoluminescence spectra. The emission and excitation spectra do not depend significantly on the wavelength of the exciting and emitted light respectively, while their shape depends strongly on the temperature. The careful analysis of the emission spectrum, which looks asymmetric and apparently structureless, suggests that two Gaussians are contributing to it (main band and red aide band, with associated average phonons of 1.25 x and 1.6 x 10-2 eV, respectively) for T < 120 K, while a third weaker component seem to increase on the high energy side (violet side band) for T > 120 K. The luminescence time decay is complex exhibiting three distinct lifetimes: the length of two of them (tl = 30 andt; = 160 ns) is temperature independent, while the third one t3 is strongly temperature-dependent. The comparison between the intensity behaviour versus temperature both, of the time decay components and of the emission spectral components brings to a tentative attribution of tl t o the main band, z2 to the violet side band, and t3 to the red side band. A scheme for the excited state energy levels, from which the emission excited by A light takes place is discussed both, by taking into account the dynamical Jahn-Teller effect and the role of the neighbouring cation vacancy. gaussiennes ("main band" et "red side band") pour T < 120 K et qu'une troisihme composante parait crottre dans la part des hautes energies pour T > 120 K ("violet side band"). Le signal de decroissance de la luminescence est complexe et est compos6 de troi composantes avec differentes valeurs de la vie moyenne: deux valeurs de la vie moyenne (tl = 30 et t 2 = 160 ns) ne dependent pas de la temperature tandis que la troisihme, t3, depende fortement de la tempbrature. Aprbs une comparaison entre l'allure de l'intensith (en function de la temp6rature) des composantes de la vie moyenne et des composantes du spectre d'bmission on va attribuer tl 8, la "main band", r2 8, la "violet side band" et t3 8, la "red side band". On discute un schema des niveaux excitAs desquels il y a l'bmission excithe avec la lumibre A en considerant l'effect Jahn-Teller et le r6le de la lacune.

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Optical spectra of aggregate centres in KCl:Pb crystals

Cited by 17 publications

References 10 publications

On the luminescence of Sn in MaCl crystals

On the luminescence of Sn in MaCl crystals

Optical properties of NaI:Pb single crystals

Spectral and time decay analysis of photoluminescence excited in the A band region in KCl:Pb

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