Structural and luminescence properties of Eu 3+ -doped magnesium sulfide borate glass and crystal

Dalhatu, S. A.; Hussin, Rosli; Deraman, Karim

doi:10.1016/j.cjph.2016.10.009

Cited by 10 publications

(1 citation statement)

References 23 publications

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“…For the highest performance for these devices the optical properties of RE ions must be correlated with their local environment in detail [5]. In order to develop new optical devices borate, silicate and phosphate glass systems have been studied as host materials for the incorporation of trivalent RE ions [6]. In view of their high RE ion solution capacity, high thermal stability, high transparency, lower melting point, lower phonon energy, ease of shaping and low cost properties, borogermanate glasses surpass phosphate, silicate or borosilicate glass systems [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Investigation of europium concentration dependence on the luminescent properties of borogermanate glasses

Gökçe

Şentürk

Uslu

et al. 2017

Journal of Luminescence

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In order to elucidate the effect of europium content on the optical and luminescent properties of borogermanate glasses, a series of Eu 3+ doped 30B 2 O 3 -40GeO 2 -(30-x)Gd 2 O 3 glasses with various doping levels (x=1-9 mol%) have been synthesized and studied with transmission, absorption, photoluminescence and decay time measurements. The transmission spectra proved that the title glasses maintained a high transparency about 80% in the 440 to 900 nm region. Based on the absorption spectra, the optical band gaps obtained from Tauc's plot can be narrowed by increasing content of Eu 3+ . From the photoluminescence spectra, the strongest red emission has been observed from the 5 D 0 → 7 F 2 level of Eu 3+ ions in borogermanate glasses. The strongest emission and excitation intensities of Eu 3+ ions are at the doping level of x=7 mol% and then these intensities decrease due to concentration quenching. The red to orange ratio (R/O) of 5 D 0 → 7 F 2 to 5 D 0 → 7 F 1 transitions has been investigated to predict the local environment of Eu 3+ ions. Judd-Ofelt (J-O) analyses have been performed from the emission spectra. The values of R/O and Ω 2 present an increase with increasing doping level, indicating the lower symmetric environment for Eu 3+ ions and higher covalency for Eu-O bond. The emission efficiency calculated from J-O theory is 75% at x=2 mol%. The decay time curves of 6 P 7/2 → 8 S 7/2 transition of Gd 3+ ions and 5 D 0 -7 F 2 transition of Eu 3+ ions confirm the energy transfer from Gd 3+ to Eu 3+ ions.

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