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Title: Effect of Tb{sup 3+} concentration on the optical and vibrational properties of YBO{sub 3} tri-doped with Eu{sup 3+}, Ce{sup 3+}, and Tb{sup 3+}

Structural and optical studies are reported of yttrium orthoborate YBO{sub 3} when tri-doped with Eu{sup 3+}, Ce{sup 3+}, and Tb{sup 3+}, focusing on the role of terbium concentration. Incorporation of Tb{sup 3+} affects emission properties for photoluminescence (PL) excited by near ultraviolet light. For constant cerium and europium concentrations, increasing the Tb{sup 3+} results in diminished PL from the Ce{sup 3+} and Tb{sup 3+} color centers. Simultaneously, the PL excitation bands related to both Ce{sup 3+} and Tb{sup 3+} increase in intensity for red emission from the Eu{sup 3+}. Results are consistent with a Ce{sup 3+} → (Tb{sup 3+}){sub n} → Eu{sup 3+} energy transfer scheme, where (Tb{sup 3+}){sub n} denotes a chain incorporating n terbium ions. A high red to orange PL intensity ratio is obtained, ranging from 1.34 to 2.09. Raman vibrational bands show a systematic change, with Tb{sup 3+} concentration, in the B{sub 3}O{sub 9} ring terminal oxygen bending mode coordinated with the yttrium site where dopant ions substitute. The structural changes are interpreted as variations in the local neighborhood of these sites in the YBO{sub 3}:Ce{sup 3+},Tb{sup 3+},Eu{sup 3+} crystal structure.
Authors:
; ;  [1] ; ;  [2] ; ;  [3] ;  [4] ;  [5]
  1. Department of Physics, Texas Tech University and Nano Tech Center, Lubbock, Texas 79409 (United States)
  2. Department of Physics, Texas State University, San Marcos, Texas 78666 (United States)
  3. Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409 (United States)
  4. Department of Electrical and Computer Engineering and Nano Tech Center, Texas Tech University, Lubbock, Texas 79409 (United States)
  5. Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409 (United States)
Publication Date:
OSTI Identifier:
22275568
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 18; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BORATES; CERIUM IONS; COLOR CENTERS; CONCENTRATION RATIO; DOPED MATERIALS; EMISSION SPECTROSCOPY; ENERGY TRANSFER; EUROPIUM IONS; EXCITATION; PHOTOLUMINESCENCE; RAMAN SPECTROSCOPY; TERBIUM IONS; ULTRAVIOLET RADIATION; VIBRATIONAL STATES; YTTRIUM COMPOUNDS