Optical absorption, luminescence spectra and upconversion of both red to green and infrared to green luminescence have been studied for a Ho3+ doped zinc tellurite glass of composition 19ZnO-80TeO(2)-1Ho(2)O(3). From the absorption data, Judd-Ofelt parameters for the Ho3+ ion are calculated along with the radiative transition rates, branching ratios and radiative lifetimes of the major Ho3+ emitting levels. The upconversion luminescence for both 646 and 754 nm excitation was attributed to a two photon excited state absorption upconversion mechanism that occurs via the I-5(7) level. For an excitation power density of 610 W/cm(2) an upconversion efficiency of 1.22% was determined for the case of 646 nm excitation, which is considerably higher than what has been reported in Ho3+ doped fluoride single crystals. Under 754 nm excitation, an upconversion efficiency of 0.27% was observed for a excitation power density of 610 W/cm(2), which is reasonably low compared to other Ho3+ doped materials

Optical transitions and upconversion properties of Ho3+ doped ZnO-TeO2 glass

SPEGHINI, Adolfo;BETTINELLI, Marco Giovanni
2003-01-01

Abstract

Optical absorption, luminescence spectra and upconversion of both red to green and infrared to green luminescence have been studied for a Ho3+ doped zinc tellurite glass of composition 19ZnO-80TeO(2)-1Ho(2)O(3). From the absorption data, Judd-Ofelt parameters for the Ho3+ ion are calculated along with the radiative transition rates, branching ratios and radiative lifetimes of the major Ho3+ emitting levels. The upconversion luminescence for both 646 and 754 nm excitation was attributed to a two photon excited state absorption upconversion mechanism that occurs via the I-5(7) level. For an excitation power density of 610 W/cm(2) an upconversion efficiency of 1.22% was determined for the case of 646 nm excitation, which is considerably higher than what has been reported in Ho3+ doped fluoride single crystals. Under 754 nm excitation, an upconversion efficiency of 0.27% was observed for a excitation power density of 610 W/cm(2), which is reasonably low compared to other Ho3+ doped materials
RARE-EARTH IONS; UP-CONVERSION; FIBER LASER
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11562/305142
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 63
  • ???jsp.display-item.citation.isi??? 69
social impact