Nature of the luminescence centers in ionic crystals

Lushchik, Ch.; Gindina, R.I.; Zazubovich, S.; Lushchik, N.E.

doi:10.1007/bf01690060

Cited by 17 publications

(8 citation statements)

References 31 publications

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“…where k 1 , k 2 , k 12 , k 21 , and k 1 (2)x are radiative transition rates from levels 1,2, non-radiative rates of phonon assisted transitions between the radiative level 2 and metastable level 1 and the quenching channel from the level 1(2), respectively. Non-radiative transitions between levels 1,2 can be written as:…”

Section: Dynamics Of the Triplet Excited State Of Bi 3+ Centersmentioning

confidence: 99%

“…with K 1 (2)x being a frequency factor and E 1 (2)x the height of the barrier. Application of the two-excited-level models on the temperature evolution of the UV luminescence intensity and decay times allowed determination of characteristic parameters of the corresponding triplet RES, e.g., the energy separation (D) between the emitting and metastable levels of the triplet RES, the rates of the radiative (k 1 , k 2 ) and nonradiative (K) transitions from these levels, and activation energy E 1 (2)x for the luminescence thermal quenching (for more details, see Refs. [9,13,[16][17][18][20][21][22]70,71]).…”

Section: Dynamics Of the Triplet Excited State Of Bi 3+ Centersmentioning

confidence: 99%

“…Luminescence of various Bi 3+ -doped materials (alkali halides; alkaline-earth oxides, sulfates and phosphates; tungstates; garnets; perovskites; silicates; borates; vanadates; niobates, etc.) was systematically investigated starting from the 1960s (see, e.g., review papers [1][2][3][4][5][6][7][8][9][10][11] and references therein). Bi 3+ -doped complex oxides, where a trivalent Bi 3+ ion substitutes for a trivalent rare-earth ion, became the subject of special interest and extensive research due to their possible applications as scintillator and phosphor materials.…”

Section: Introductionmentioning

confidence: 99%

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Luminescence Spectroscopy and Origin of Luminescence Centers in Bi-Doped Materials

et al. 2020

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Bi-doped compounds recently became the subject of an extensive research due to their possible applications as scintillator and phosphor materials. The oxides co-doped with Bi3+ and trivalent rare-earth ions were proposed as prospective phosphors for white light-emitting diodes and quantum cutting down-converting materials applicable for enhancement of silicon solar cells. Luminescence characteristics of different Bi3+-doped materials were found to be strongly different and ascribed to electronic transitions from the excited levels of a Bi3+ ion to its ground state, charge-transfer transitions, Bi3+ dimers or clusters, radiative decay of Bi3+-related localized or trapped excitons, etc. In this review, we compare the characteristics of the Bi3+-related luminescence in various compounds; discuss the possible origin of the corresponding luminescence centers as well as the processes resulting in their luminescence; consider the phenomenological models proposed to describe the excited-state dynamics of the Bi3+-related centers and determine the structure and parameters of their relaxed excited states; address an influence of different interactions (e.g., spin-orbit, electron-phonon, hyperfine) as well as the Bi3+ ion charge and volume compensating defects on the luminescence characteristics. The Bi-related luminescence arising from lower charge states (namely, Bi2+, Bi+, Bi0) is also reviewed.

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Section: Dynamics Of the Triplet Excited State Of Bi 3+ Centersmentioning

confidence: 99%

Section: Dynamics Of the Triplet Excited State Of Bi 3+ Centersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Luminescence Spectroscopy and Origin of Luminescence Centers in Bi-Doped Materials

et al. 2020

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“…The very weak 4.56 eV emission (curve 1") can also be excited in the narrow energy region near 6.1 eV (curve 2"), its intensity being about four times smaller than that of the main emission. At this excitation, the intensity ratio of the (2), (2") excitation, and (3), (3') polarization spectra as well as (4), (4') the angular dependences of the polarization degree measured for the (1) to (4), (1") Ax, (1') to (4'), (I") AT, and (I"), ( 2 ) 4.56eV emission bands at excitation in the (I), (1') A absorption band of TI' centres and (1") in the high-energy absorption bands of CsCl :TI. Polarization characteristics of the slow ( 0 ) and fast (+) decay components of the emission.…”

Section: Spectral Characteristics Of Luminescence and Their Temperatumentioning

confidence: 99%

Luminescence of CsCl: Tl Single Crystals

Nagirnyi¹,

Zazubovich²,

Jaanson³

1993

Physica Status Solidi (b)

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Spectral, polarization, and kinetic characteristics of CsCl : T1 luminescence are studied between 4.2 and 350 K. The Ax band at 3.88 eV and the AT band at 3.65 eV are observed in the triplet emission spectrum of TI' centres. It is shown that in the triplet relaxed excited state (RES) the trigonal (X) minima are of higher energy than the tetragonal (T) ones. The symmetry of both the emitting and the metastable states in each (X or T) minimum is the same, and in many respects their structure is similar to that of other nsz ions in alkali halides. However, some peculiarities are observed in the luminescence characteristics of CsCl : T I crystals (e.g. very small quantum efficiency of triplet emission at excitation in high-energy absorption bands; population of the lower (T) minima mainly in the process of vibronic relaxation in the triplet excited state; too large polarization degree of the slow decay component of the A, emission, exceeding 1.5 times its theoretical limit; large difference in the spin-orbit splitting energies S of the triplet RES in the X and the T minima as well as in radiative decay probabilities y , of their metastable states; the absence of an off-centre displacement of the excited TI' ion from the crystal lattice site, etc.). Possible reasons for these features are discussed.

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“…Lushchik and Zazubovich [3] found that the symmetry of the emitting centers was tetragonal owing to the prevailing effect of the charge compensating vacancy in a next-nearest-neighbour position (n.n.n.) in the ground state.…”

Section: Introductionmentioning

confidence: 99%

Symmetries of Luminescent Centers in NaCl:Pb²⁺ Excited in the A‐Absorption Band

Benci¹,

Fermi²,

Reverberi³

1982

Physica Status Solidi (b)

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Polarized luminescence measurements are used t o study the luminescent characteristics of -U ; L C I : P~?~ excited into the A-absorption band. For the El = 4.01 eV emission it is found that the luminescent centers have tetragonal and trigonal symmetries due to the Jahn-Teller effect that itlIows the coexistence of tetragonal and trigonal minima on the 3T1U APES while the E, = = 3.29 eV emission band is due to aggregates of impurities in the { 111) planes with trigonal symmetry. The charge compensating vacancy associated to the impurity gives a meaningless effect on the luminescence polarization and its position cannot be ascertained.Nessungen der polarisierten Lumineszenz werden benutzt, urn die LumineszenzcharaMRrist~en von NaCI:Pb2+ zu untersuchen, das in die A-Absorptionsbande angeregt wird. Fur die E, = = 4,Ol eV-Emission wird gefunden, daD die Lumineszenzzentren tetragonale und trigonale Symmetrie infolge des Jahn-Teller-Effekts besitzen, was die gleichzeitige Existenz von tetragonalen und trigonalen Ninima auf den 3T1U-APES erlaubt, wlhrend die E, = 3,29 eV-Emissionsbande durch Storstellenagglomerate in den { 111)-Ebenen mit trigonaler Symmetrie hervorgerufen wird. Die mit der Storstelle verknupfte ladungskornpensierende Leentelle ergibt einen vernachllssigbaren Effekt anf die Lumineszenzpolarisation, und ihre Position kann nicht ermittelt werden. = (Iz -I g ) / ( I z $-I , ) , parallel; b) Ph) = (1, -14i(Iz -L 1,)

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Nature of the luminescence centers in ionic crystals

Cited by 17 publications

References 31 publications

Luminescence Spectroscopy and Origin of Luminescence Centers in Bi-Doped Materials

Luminescence Spectroscopy and Origin of Luminescence Centers in Bi-Doped Materials

Luminescence of CsCl: Tl Single Crystals

Symmetries of Luminescent Centers in NaCl:Pb²⁺ Excited in the A‐Absorption Band

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Nature of the luminescence centers in ionic crystals

Cited by 17 publications

References 31 publications

Luminescence Spectroscopy and Origin of Luminescence Centers in Bi-Doped Materials

Luminescence Spectroscopy and Origin of Luminescence Centers in Bi-Doped Materials

Luminescence of CsCl: Tl Single Crystals

Symmetries of Luminescent Centers in NaCl:Pb2+ Excited in the A‐Absorption Band

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Product

Resources

About

Symmetries of Luminescent Centers in NaCl:Pb²⁺ Excited in the A‐Absorption Band