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Photoluminescence of monovalent indium centres in phosphate glass

View Article: PubMed Central

ABSTRACT

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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PL-PLE contour plots of xIn2Oα–60ZnO–40P2O5 glasses using an intensity axis on a linear scale.(a) x = 0.1, (b) x = 0.5, (c) x = 1.0, and (d) x = 2.0.
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f3: PL-PLE contour plots of xIn2Oα–60ZnO–40P2O5 glasses using an intensity axis on a linear scale.(a) x = 0.1, (b) x = 0.5, (c) x = 1.0, and (d) x = 2.0.

Mentions: Figure 3 shows PL-PLE contour plots of xIn2Oα–60ZnO–40P2O5 glasses. For all glasses, we observed non-symmetric emission bands with long tails toward the lower photon energy region. All excitation bands (A, B, and C) exhibited emissions at 3.2 eV (Supplemental Fig. 1), which suggests that PL is independent of the excitation energy and that the energy level for radiative relaxation is fixed in these glasses.


Photoluminescence of monovalent indium centres in phosphate glass
PL-PLE contour plots of xIn2Oα–60ZnO–40P2O5 glasses using an intensity axis on a linear scale.(a) x = 0.1, (b) x = 0.5, (c) x = 1.0, and (d) x = 2.0.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4555169&req=5

f3: PL-PLE contour plots of xIn2Oα–60ZnO–40P2O5 glasses using an intensity axis on a linear scale.(a) x = 0.1, (b) x = 0.5, (c) x = 1.0, and (d) x = 2.0.
Mentions: Figure 3 shows PL-PLE contour plots of xIn2Oα–60ZnO–40P2O5 glasses. For all glasses, we observed non-symmetric emission bands with long tails toward the lower photon energy region. All excitation bands (A, B, and C) exhibited emissions at 3.2 eV (Supplemental Fig. 1), which suggests that PL is independent of the excitation energy and that the energy level for radiative relaxation is fixed in these glasses.

View Article: PubMed Central

ABSTRACT

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.

No MeSH data available.


Related in: MedlinePlus