Thermal and size effect on the R lines luminescence in YAG:Cr3+

Erdem M., Ozen G., YAHŞİ U., Di Bartolo B.

JOURNAL OF LUMINESCENCE, cilt.158, ss.464-468, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 158
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.jlumin.2014.10.053
  • Dergi Adı: JOURNAL OF LUMINESCENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.464-468
  • Anahtar Kelimeler: Vibronic side-bands, Line shift, Line broadening, Nanocrystals, TEMPERATURE-DEPENDENCE, CHROMIUM IONS, YAG, SPECTRA, FLUORESCENCE, NANOCRYSTALS, CRYSTALS, CR3+
  • Marmara Üniversitesi Adresli: Evet

Özet

We have studied the line positions and widths of R lines luminescence of nanopowder samples of Y3Al5O12: Cr (3+) particles with diameters ranging from about 28 to 250 nm. For each sample we have measured accurately the emission spectrum from 30 K to 300 K. The spectra generally consisted of the R-lines narrow spectral emission and of the accompanying vibronic side-bands. From larger to shorter diameters of powders at each temperature we noticed an increase of the width at half-maxima of the R lines luminescence. The emissions were shifted towards lower energies when increasing the temperature from 30 K to 300 K. The temperature dependent broadening and shift of the R lines in the different samples can be accounted for by adjusting the electron-phonon parameters in the formulas describing these processes and using the same Debye temperature of the bulk material. (C) 2014 Elsevier B.V. All rights reserved.