Self-trapped excitons in caesium iodide. II. Magneto-optical properties

Falco, L. De; Weid, J. P. von der; Aegerter, Michel A.; Iida, Takuya; Nakaoka, Yasuhiro

doi:10.1088/0022-3719/13/6/010

Cited by 15 publications

(4 citation statements)

References 5 publications

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“…A sharp decrease in τ SC of the A T and of the A X emission at temperatures 10-40 K, accompanied by the changes in the sign of the degree of polarization (P ) as well as in the P (α) dependences, indicates the thermal population of the singlet state of the STE from the triplet RES (see also [4]). The energy distance between the triplet and the singlet state ( E s−t ) calculated from the τ (T ) dependences in this temperature region, as well as the other parameters of the excited states responsible for the visible emission bands of the crystals studied (table 2), are similar to those observed for the emission of the STEs in alkali chlorides and bromides [6,[11][12][13][14][23][24][25][26][27][28][29][30][31][32][33][34] (see table 3).…”

Section: Discussionsupporting

confidence: 57%

Relaxed excited state structure and luminescence of thallium-doped caesium chloride and bromide

Mihóková

Nagirnyi

Nikl

et al. 1996

J. Phys.: Condens. Matter

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Four bands, all belonging to the main thallium centres, have been detected in the emission spectra of CsCl:Tl and CsBr:Tl crystals. Their spectral, polarization and kinetic characteristics have been studied from 0.45 up to 360 K. It has been shown that the new model proposed by us recently for the relaxed excited state (RES) structure of the luminescence centre in CsI:Tl crystals is valid for CsCl:Tl and CsBr:Tl crystals as well. Two ultraviolet emission bands excited mainly in the A absorption band of centres are ascribed to electronic transitions from trigonal and tetragonal Jahn - Teller minima of the triplet RES of . Two visible bands excitable mainly in the higher energy absorption bands of CsCl:Tl and CsBr:Tl are connected with two different off-centre configurations of self-trapped exciton perturbed by the ion. The parameters of the corresponding excited state minima have been calculated. The mixing of the impurity and halogen excited states has been shown to decrease markedly in the sequence of anions .

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Section: Discussionsupporting

confidence: 57%

Relaxed excited state structure and luminescence of thallium-doped caesium chloride and bromide

Mihóková

Nagirnyi

Nikl

et al. 1996

J. Phys.: Condens. Matter

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“…3,4 Two luminescence bands peaking at 4.3 and 3.7 eV are attributed to the STE's in CsI. [3][4][5][6][7][8][9][10][11] Iida et al 3,7,8 have assigned the 4.3-eV band to the d-like 3 ⌫ 5 Ϫ STE state composed of the ⌫ 3 ϩ ͑5d) electron and the ⌫ 2 Ϫ ͑5p) hole, and the 3.7-eV band to the s-like 3 ⌫ 5 Ϫ STE state composed of the ⌫ 1 ϩ ͑6s) electron and the ⌫ 2 Ϫ ͑5p) hole. These spin-triplet 3 ⌫ 5…”

Section: Introductionmentioning

confidence: 99%

Hydrostatic pressure effects on the free and self-trapped exciton states in CsI

1996

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The s-like (⌫ 8 Ϫ ,⌫ 6 ϩ ) and d-like (⌫ 8 Ϫ , ⌫ 8 ϩ ) free exciton ͑FE͒ states and the corresponding self-trapped exciton ͑STE͒ states in CsI have been studied under hydrostatic pressure up to 1.3 GPa. As the pressure is increased, the lowest-energy FE state is changed from the s-likeand consequently the lowest-energy STE state is changed from the s-like state to the d-like state: The latter is evidenced by the replacement of the s-like STE luminescence ͑3.7-eV band͒ by the d-like STE luminescence ͑4.7-eV band͒. At high pressure the s-like and d-like STE's fall into a quasithermal equilibrium distribution. Based on the results, we discuss the pressure-induced changes of the adiabatic potential energy surfaces of the STE states in CsI. ͓S0163-1829͑96͒08347-6͔ HYDROSTATIC PRESSURE EFFECTS ON THE FREE . . .

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“…-In alkali halides, the self-trapped exciton (STE) can be regarded as an électron bound to a self-trapped hole (V k center). Its symmetry axis lies along the < 110 > direction [1] (NaCl structure) or the < 100 > direction [2] (CsCl structure). We hâve studied the magnetic circular polarization (MCP) and the microwave induced transient response of the triplet state luminescence in NaCl, KC1, RbCl, KBr, RbBr and CsBr in order to study the triplet state relaxation processes and the electronic structure.…”

mentioning

confidence: 99%

“…-Single crystals hâve been placed in an X-band cavity such that the < 110 > axis « 100 > for CsBr) lies parallel to the magnetic field. The luminescence was excited continuously by X-rays and detected by the conventional technique [2,3].…”

mentioning

confidence: 99%

Relaxation processes of the triplet state of self-trapped excitons in alkali-halide crystals

et al. 1980

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Les processus de relaxation spin-réseau, de transition radiative et d'excitation microonde ont été étudiés pour l'exciton autopiégé triplet dans les chlorures et bromures d'alcalins en mesurant la réponse transitoire à des impulsions de microonde de la luminescence excitée par rayons X. Le modèle est appliqué aux résultats expérimentaux de la polarisation circulaire. La symétrie du couplage dominant exciton-phonon est discutée.

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Self-trapped excitons in caesium iodide. II. Magneto-optical properties

Cited by 15 publications

References 5 publications

Relaxed excited state structure and luminescence of thallium-doped caesium chloride and bromide

Relaxed excited state structure and luminescence of thallium-doped caesium chloride and bromide

Hydrostatic pressure effects on the free and self-trapped exciton states in CsI

Relaxation processes of the triplet state of self-trapped excitons in alkali-halide crystals

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