Photoconductivity of KBr Containing<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>F</mml:mi></mml:math>Centers

Crandall, Richard S.; Mikkor, M.

doi:10.1103/physrev.138.a1247

Cited by 29 publications

(2 citation statements)

References 11 publications

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“…4) the characteristic Ce-related band is situated at the wavelengths almost entirely above the long wavelength limit of the Ce 3 + emission band. On the other hand, the featureless and flat component that actually does overlap the Ce3+ emission band, may well not be intrinsic to Ce and may, instead, originate in various defects characteristic of the YAG host as suggested before [5][6][7]. Since concentrations of defects can be manipulated in many ways (doping with aliovalent ions, annealing in different atmospheres and so on) it may well be that the ESA in the critical range of wavelengths can also be modified and, hopefully, reduced.…”

Section: Introductionmentioning

confidence: 90%

Excited State Absorption and Thermoluminescence in Ce and Mg Doped Yttrium Aluminum Garnet

et al. 1999

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In this paper we report preliminary results of optical studies on Y3 Al5012 (YAG) crystals codoped with Ce and Mg. By using measurements of luminescence, absorption, and luminescence excitation spectra we demonstrate that although the basic features introduced to the YAG host by the Ce-doping remain intact, the Mg-codoping imposes some significant changes on other properties of the material. These changes are potentially important for laser and/or scintillator applications of YAG:Ce and are due, most likely, to modifications of defect populations in the material. We characterize them by using the techniques of thermoluminescence and excited state absorption under excimer laser pumping. These techniques, interestingly, yield results that seem inconsistent. While the thermoluminescence signal of the Mg-doped sample is strongly reduced, suggesting that trap concentrations in the presence of Mg are suppressed, the excited state absorption signal, which we also relate to the traps, is higher. We offer a tentative explanation of this contradiction between the two experiments that involves a massive transfer of electrons from the Mg-related defects to the excited state absorption centers caused by the excimer pump itself.

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Section: Introductionmentioning

confidence: 90%

Excited State Absorption and Thermoluminescence in Ce and Mg Doped Yttrium Aluminum Garnet

et al. 1999

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“…= lê^-D|^ + lê^-Dl^ = |D|^ -|k.D|^11" the bound, part of the final state is an s state, D will "point" the direction of k since the bound initial and final states will, be e the angle between k and D is also the scattering angle, and we may integrate over 3. Integration yields that this equation has been derived for absorbing vacuum ^ ° centers in a vacuum.Final state wave function and evaluation of matrix elementThe final state of the F' center after absorption of a photon consists, as said before, of one bound and one free electron.Since operates only on the space coordinates of the final state wave function, the spins must remain unchanged.…”

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A study of the F-center in several alkali halides

Robinson

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Stress‐Induced Inhomogeneous Effects of the K‐Absorption in RbCl

Maier

Gebhardt

1968

Physica Status Solidi (b)

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The change in the K-absorption in additively coloured RbCl under applied uniaxial stress is investigated. A new technique with an ac-stress is applied. The effects are compared with the change in the absorption shape in Be++ doped crystals. The analysis reveals two components of the K-absorption, K, and K,, which behave differently under external perturbations. The K,-component coincides with the spectral range of high photoconductivity.Die Bnderungen der K-Absorption in additiv verfiirbtem RbCl unter uniaxialem Druck wird untersucht, wobei eine neue Technik der Druckmodulation angewendet wird. Die Effekte werden verglichen mit der h d e r u n g der Bandenform in Bat dotierten Kristallen.Die Analyse ergibt zwei Komponenten der K-Absorption, K, und K,, die sich bei iiuDeren Storfeldern verschieden verhalten. Die K,-Komponente fallt mit dem Bereich der hohen Photoleitfahigkeit zusammen.

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Photoconductivity of KBr ContainingFCenters

Cited by 29 publications

References 11 publications

Excited State Absorption and Thermoluminescence in Ce and Mg Doped Yttrium Aluminum Garnet

Excited State Absorption and Thermoluminescence in Ce and Mg Doped Yttrium Aluminum Garnet

A study of the F-center in several alkali halides

Stress‐Induced Inhomogeneous Effects of the K‐Absorption in RbCl

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