Study of the spectroscopic properties and infrared‐to‐visible up‐conversion fluorescence of Er3+‐doped germanate glasses

Raman scattering, optical absorption and photoluminescence studies have been performed on Er3+-doped Na2O–Nb2O5–GeO2 germanate-based glasses. The main bands in the Raman spectra involve vibrational modes associated with the germanium oxide network. Judd–Ofelt intensity parameters were determined and then used to calculate the radiative transition rates and excited-state radiative lifetimes. Green and red up-conversion luminescence was observed at room temperature under 800 nm laser line excitation. The emission intensities have a quadratic dependence on the excitation pump power, indicating a two-step up-conversion mechanism. The intensity of the 660 nm red band shows an increase relative to the 554 nm green band with increasing Er3+ content. Combined with the time-resolved luminescence data of the emitting states, we suggest from these results that the up-conversion process is attributed to a competitive situation of excited-state absorption and energy transfer between excited ions accompanied by multiphonon relaxation. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

[1]  M. Naumann,et al.  Predicting the performance data for a fiber laser by measuring the emitted fluorescence power of the end-on pumped fiber , 1997 .

[2]  Renata Reisfeld,et al.  Judd-Ofelt parameters and chemical bonding☆ , 1983 .

[3]  F Auzel,et al.  A fundamental self-generated quenching center for lanthanide-doped high-purity solids , 2002 .

[4]  Soga,et al.  Compositional dependence of Judd-Ofelt parameters of Er3+ ions in alkali-metal borate glasses. , 1992, Physical review. B, Condensed matter.

[5]  Anne C. Tropper,et al.  Fabrication and optical properties of lead‐germanate glasses and a new class of optical fibers doped with Tm3+ , 1993 .

[6]  W. White,et al.  Raman spectroscopic investigation of the structure and crystallization of binary alkali germanate glasses , 1980 .

[7]  M. Fleet,et al.  The structure of glasses along the Na2OGeO2 join , 1991 .

[8]  J. P. van der Ziel,et al.  1.5‐μm infrared excitation of visible luminescent in Y1−xErxF3 and Y1−x−yErxTmyF3 via resonant‐energy transfer , 1986 .

[9]  H. Verweij,et al.  The structure of lithium, sodium and potassium germanate glasses, studied by Raman scattering , 1979 .

[10]  E. Pun,et al.  Er3+-doped Na2O·Cd3Al2Si3O12 glass for infrared and upconversion applications , 2001 .

[11]  Soga,et al.  Upconversion properties, multiphonon relaxation, and local environment of rare-earth ions in fluorophosphate glasses. , 1992, Physical review. B, Condensed matter.

[12]  F. Auzel,et al.  Upconversion processes in coupled ion systems , 1990 .

[13]  Nasser N Peyghambarian,et al.  Er3+ doped Na2O–Nb2O5–TeO2 glasses for optical waveguide laser and amplifier , 2003 .

[14]  Steven H. Morgan,et al.  Host‐dependent optical transitions of Er3+ ions in lead–germanate and lead‐tellurium‐germanate glasses , 1996 .

[15]  K. Rajnak,et al.  Electronic Energy Levels in the Trivalent Lanthanide Aquo Ions. I. Pr3+, Nd3+, Pm3+, Sm3+, Dy3+, Ho3+, Er3+, and Tm3+ , 1968 .

[16]  H. Maaref,et al.  Time-resolved luminescence data on the 1060 nm transition in Nd3+-doped zinc tellurite glasses , 2000 .

[17]  R. Peacock.  The intensities of lanthanide f ↔ f transitions , 1975 .

[18]  W. A. Sibley,et al.  Optical transitions of Er 3 + ions in fluorozirconate glass , 1983 .

[19]  Setsuhisa Tanabe,et al.  Upconversion fluorescences of TeO2- and Ga2O3-based oxide glasses containing Er3+ , 1990 .

[20]  Jianhui Yang,et al.  Investigation on nonradiative decay of 4I13/2→-4I15/2 transition of Er3+-doped oxide glasses , 2004 .

[21]  A. S. Gouveia-Neto,et al.  Upconversion fluorescence spectroscopy of Er3+/Yb3+-doped heavy metal Bi2O3Na2ONb2O5GeO2 glass , 1998 .

[22]  P. D. Sarkisov,et al.  Structure of lead germanate glasses by Raman spectroscopy , 2001 .

[23]  C. Pedrini,et al.  Excited-state absorption and energy transfer in Er3+ doped LiYF4 , 1986 .

[24]  Petrin,et al.  Energy transfer between Er3+ and Tm3+ ions in a barium fluoride-thorium fluoride glass. , 1989, Physical review. B, Condensed matter.

[25]  M. Catauro,et al.  Glass transition temperature and devitrification study of barium germanate glasses , 1997 .

[26]  B. Judd,et al.  OPTICAL ABSORPTION INTENSITIES OF RARE-EARTH IONS , 1962 .

[27]  G. S. Ofelt.  Intensities of Crystal Spectra of Rare‐Earth Ions , 1962 .

[28]  A. Marques,et al.  Vibrational spectra and structure of alkali germanate glasses , 2001 .

[29]  M. J. Weber,et al.  Probabilities for Radiative and Nonradiative Decay of Er 3 + in La F 3 , 1967 .