Compositional dependence of upconversion luminescence of Er[sup 3+] in ZrF[sub 4]-based glasses. III. Anion substitution effect

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1993.1108· OSTI ID:6299980

Kawamoto, Y; Kanno, R; Yokota, R; Takahashi, M ^[1]; Tanabe, S; Hirao, K ^[2]

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1. Kobe Univ. (Japan)
2. Kyoto Univ. (Japan)

As one of the compositional designs for enhancing the unconversion luminescence efficiency of Er[sup 3+] in ZrF[sub 4]-based glasses, the anion substitution effect has been examined in glasses 58ZrF[sub 4][center dot](39-x)BaF[sub 2][center dot]xBaX[sub 2][center dot]3Er(or Eu)F[sub 3] (x = 0-29 for X = Cl and x = 0-10 for X = Br in batch compositions). Prominent enhancement of upconversion emission intensity was observed on the substitution of Cl for F. The Cl substitution brought about two effects, of which one was an increase in the deviation from inversion symmetry in the F[sup [minus]] coordination around Er[sup 3+] and the other was an increase in both phonon energy and electron-phonon coupling strength. The former raises the transition probability in the upconversion process, leading to an enhancement of the emission intensity, while the latter increases the multiphonon relaxation in the upconversion process, leading to a reduction of the emission intensity. Due to these antithetical effects on the upconversion process, the upconversion emission intensity of the Cl substituted glasses exhibits a maximum value around the 58ZrF[sub 4][center dot]20BaF[sub 2][center dot]19BaCl[sub 2][center dot]3ErF[sub 3] composition. The substitution of small amounts of Cl for F is concluded to be quite effective for enhancing the upconversion efficiency of ZrF[sub 4]-based glasses. 11 refs., 7 figs., 2 tabs.

• OSTI ID: 6299980
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 103:2; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM BROMIDES
BARIUM CHLORIDES
BARIUM COMPOUNDS
BARIUM FLUORIDES
BROMIDES
BROMINE COMPOUNDS
CATIONS
CHARGED PARTICLES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COUPLING
ELECTRON-PHONON COUPLING
EMISSION
ERBIUM COMPOUNDS
ERBIUM FLUORIDES
EUROPIUM COMPOUNDS
EUROPIUM FLUORIDES
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IONS
LUMINESCENCE
PHONONS
PROBABILITY
QUASI PARTICLES
RARE EARTH COMPOUNDS
REDUCTION
RELAXATION
STOICHIOMETRY
SYMMETRY
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM FLUORIDES