Principal phosphor materials and their optical properties

Tanimizu, Shinkichi

doi:10.1201/9781420005233.ch3

Cited by 3 publications

(4 citation statements)

References 347 publications

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“…Bands A and B are associated with spin-forbidden transitions ( 1 S 0 → 3 P 1 , 1 S 0 → 3 P 2 ), whereas B and C is attributed to a spin-allowed transition ( 1 S 0 → 1 P 1 ). This assignment is consistent with previous reports on In + emissions bands in alkali halides 10 17 18 19 20 21 22 23 , except for the relative PLE band intensity. If this assignment is correct, it indicates that energy loss from phonon vibrations strongly affects intersystem crossing and decreases emissions intensity compared to the low-absorption region.…”

Section: Discussionsupporting

confidence: 93%

“…On the other hand, In + is used as an n s 2 -type centre in halide phosphors. The n s 2 -type ions ( n = 4, 5, 6) are light-emitting ions exhibiting an n s 2 electron configuration in the ground state and an n s 1 n p 1 configuration in the excited state 10 . The emissions properties of several n s 2 -type ions have been reported, including alkali halides 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 and several oxides 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 .…”

mentioning

confidence: 99%

“…One of our research interests is the local symmetry of these n s 2 -type centres in amorphous oxide glasses. Although emissions of In + in alkali halides is conventionally recognised to have O h symmetry 10 , it is expected that an In + cation with a lone pair of electrons will have low symmetry in glasses with a random network. In addition, the origin of high quantum yield (QY) attained only in Sn 2+ -doped glass 39 40 has not yet been clarified.…”

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confidence: 99%

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Photoluminescence of monovalent indium centres in phosphate glass

Masai

Yamada

Okumura

et al. 2015

Sci Rep

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Valence control of polyvalent cations is important for functionalization of various kinds of materials. Indium oxides have been used in various applications, such as indium tin oxide in transparent electrical conduction films. However, although metastable In+ (5 s2 configuration) species exhibit photoluminescence (PL), they have attracted little attention. Valence control of In+ cations in these materials will be important for further functionalization. Here, we describe In+ species using PL and X-ray absorption fine structure (XAFS) analysis. Three absorption bands in the UV region are attributed to the In+ centre: two weak forbidden bands (1S0 → 3P1, 1S0 → 3P2) and a strong allowed band (1S0 → 1P1). The strongest PL excitation band cannot be attributed to the conventional allowed transition to the singlet excited state. Emission decay of the order of microseconds suggests that radiative relaxation occurs from the triplet excitation state. The XAFS analysis suggests that these In+ species have shorter In–O distances with lower coordination numbers than in In2O3. These results clearly demonstrate that In+ exists in a metastable amorphous network, which is the origin of the observed luminescent properties.

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Section: Discussionsupporting

confidence: 93%

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confidence: 99%

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confidence: 99%

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Photoluminescence of monovalent indium centres in phosphate glass

Masai

Yamada

Okumura

et al. 2015

Sci Rep

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“…In RbLa 2 Ti 2 TaO 10 :Eu 3+ , the 5 D 0 -7 F 1 transition is the highest intensity among all transitions. Strong 5 D 0 -7 F 1 transition indicates that the emission is controlled by a magnetic dipole transition [10]. This result is consistent with the expectation that Eu 3+ ions in the layered perovskite structure RbLa 2 Ti 2 TaO 10 can occupy the 2h (La) site.…”

Section: Resultssupporting

confidence: 90%

Suppress of Concentration Quenching by Site Engineering Concept

Imanari

Hasegawa

Watanabe

et al. 2016

AMM

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Red-emitting RbLa2Ti2TaO10:Eu3+ phosphors were synthesized by a conventional solid-state reaction method, and crystal structure and photoluminescence properties were investigated in the detail. RbLa2Ti2TaO10 has tetragonal structure with a space group of P4/mmm, in which the B-site cations (Ta and Ti) are arranged into non-ordering sequence. The RbLa2Ti2TaO10:Eu3+ phosphors exhibited strong red emission, which is due to the 4f-4f transitions of Eu3+, at excitation wavelength of 396 nm. The concentration quenching phenomena for RbLa2Ti2TaO10:Eu3+ phosphors was investigated using percolation model with two-dimensional interactions among the Eu3+ sites in the host lattice. Both the critical concentration values with the calculation and experiment are estimated to be x = 0.3-0.4, which indicates that the concentration quenching for RbLa2Ti2TaO10:Eu3+ phosphors was due to the energy transfer between the nearest Eu3+ ions in these compounds

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Synthesis and photoluminescence investigation of (Ba0.97-M )Y2Si3O10:0.03Eu2+ and Ba0.97(Y2-RE )Si3O10:0.03Eu2+ (M = Ca, Sr; RE = La, Yb) by cation substitution

Liang

Zhu

et al. 2017

Materials Research Bulletin

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Principal phosphor materials and their optical properties

Cited by 3 publications

References 347 publications

Photoluminescence of monovalent indium centres in phosphate glass

Photoluminescence of monovalent indium centres in phosphate glass

Suppress of Concentration Quenching by Site Engineering Concept

Synthesis and photoluminescence investigation of (Ba0.97-M )Y2Si3O10:0.03Eu2+ and Ba0.97(Y2-RE )Si3O10:0.03Eu2+ (M = Ca, Sr; RE = La, Yb) by cation substitution

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