Remark on the optical gap in ZnO–Bi2O3–TeO2 glasses

Ozdanova, Jitka; Tichá, H.; Tichý, L.

doi:10.1016/j.jnoncrysol.2007.06.017

Cited by 48 publications

(22 citation statements)

References 22 publications

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“…2, the obtained PL emission band around 1.77 eV (700 nm) does not change with the temperature, from 35 up to 300 K, showing a high thermal stability for this optical transition. Indeed, this result is in agreement with the previously reported papers that state that highly located defect states and the formation of nanocrystallized glass can be related to the fact that nanocomposites in glasses and deeper energy levels of the defects show a low temperature dependence of the optical transition energy [31][32][33], in contrast to the strong temperature dependence of the optical gap observed for glasses [34,35].…”

Section: Resultssupporting

confidence: 93%

Eu3+ photoluminescence enhancement due to thermal energy transfer in Eu2O3-doped SiO2–B2O3–PbO2 glasses system

Lourenço

Dantas

Serqueira

et al. 2011

Journal of Luminescence

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a b s t r a c tIn this work, Eu 3 + -doped lead borosilicate glasses (SiO 2 -B 2 O 3 -PbO 2 ) synthesized by fusion method had their optical properties investigated as a function of temperature. Atomic Force Microscopy images obtained for a glass matrix annealed at 350 and 500 1C show a precipitated crystalline phase with sizes 11 and 21 nm, respectively. Besides, as the temperature increases from 350 to 300 K a strong Eu 3 + photoluminescence (PL) enhancement takes place. This anomalous feature is attributed to the thermally activated carrier transfer process from nanocrystals and charged intrinsic defects states to Eu 3 + energy levels. In addition, the PL peaks in this temperature range were assigned to the Eu 3 + transitions 5 D 0 -7 F 2 , at 612 nm, 5 D 0 -7 F 1 , at 595 nm, and 5 D 0 -7 F 0 , at 585 nm. It was also observed that the 5 D 0 -7 F 3 and 5 D 0 -7 F 4 PL bands at 655 and 700 nm, respectively, show a continuous decrease in intensity as the temperature increases.

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Section: Resultssupporting

confidence: 93%

Eu3+ photoluminescence enhancement due to thermal energy transfer in Eu2O3-doped SiO2–B2O3–PbO2 glasses system

Lourenço

Dantas

Serqueira

et al. 2011

Journal of Luminescence

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“…The RB 459 -RB 764 seems to be typical for tellurite matrix in various tellurite glasses: WO 3 -TeO 2 [32], ZnO-Bi 2 O 3 -TeO 2 [33], PbO-WO 3 -TeO 2 [34]. Hence, in accordance with [32][33][34] we assign observed RB as follows: (i) RB 666 to sym- [37]. This observation can also be Fig.…”

Section: Raman Spectral Studiessupporting

confidence: 78%

Optical band gap, glass transition temperature and structural studies of (100−2x)TeO2–xAg2O–xWO3 glass system

Upender

Ramesh

Prasad

et al. 2010

Journal of Alloys and Compounds

140

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“…The absorption coefficient, a (cm À1 ) was calculated by dividing absorbance with sample thickness. Since our glasses were thick (0.06-0.13 cm) we could not determine the true optical bandgap by Tauc plots or Mott-Davis models which require the measurement of a $ 10 3 -10 4 cm À1 [9,26]. The absorption cut-off was taken as the wavelength at which optical absorption begins to increase abruptly.…”

Section: Uv-visible Spectroscopymentioning

confidence: 99%

“…Recently tellurite glasses doped with heavy metal and rare earth oxides have received significant attention because they can favorably change density, optical and thermal properties of tellurite glasses [5][6][7][8][9][10][11][12]. Tellurite glasses find applications for up conversion of infrared to visible light [13][14][15][16], ultra broadband fiber Raman amplifiers [17] and gas sensors [18].…”

Section: Introductionmentioning

confidence: 99%