N. Sooraj Hussain

Spectra of Sm3 and Dy3: B2O3–P2O5–R2SO4 Glasses

Abstract This paper reports the production of both samarium and dysprosium glasses in the composition of 44.5B 2 O 3 + 44.5P 2 O 5 + 10R 2 SO 4 (where R = Li, Na, and K). For these optical glasses, physical, absorption, and photoluminescence spectral properties have been studied. On excitation with 402 nm, the Sm 3+ glasses were found to be orange fluorescent in color and the richness of that color was high in the K + glass, compared to the Li + and the Na + glasses. Similarly, on excitation with 398 nm, the Dy 3+ glasses were fluorescent yellow in color and that color was more rich in the K + glass.This paper reports the production of both samarium and dysprosium glasses in the composition of 44.5B{sub 2}O{sub 3} + 44.5P{sub 2}O{sub 5} + 10R{sub 2}SO{sub 4} (where R = Li, Na, and K). For these optical glasses, physical, absorption, and photoluminescence spectral properties have been studied. On excitation with 402 nm, the Sm{sup 3+} glasses were found to be orange fluorescent in color and the richness of that color was high in the K{sup +} glass, compared to the Li{sup +} and the Na{sup +} glasses. Similarly, on excitation with 398 nm, the Dy{sup 3+} glasses were fluorescent yellow in color and that color was more rich in the K{sup +} glass.

Luminescence spectra of Eu3+-doped GeO2-PbO-Bi2O3 glasses

Abstract Europium-doped germanium-lead bismuth based glasses in the chemical composition of 62GeO 2 -(13-X) PbO-25Bi 2 O 3 -XEu 2 O 3 (where X = 0.1, 0.2, 0.5, 1.0, and 1.5 mol%) have been prepared and carried out in a systematic study on their emission spectra. Upon exposure to the UV source (200–270 nm) these glasses have shown bright reddish orange phosphorescent color that lasted for about half an hour. From the measured glass refractive index (n d = 1.871) and density (5.965 g·cm −3 ), glass reflectivity, number of luminescent ions (N eu 3+ ), and inter ionic distance (r eu-eu ) values of these europium glasses have been computed. The PL spectra of these glasses have shown emission transitions ( 5 D 0 → 7 F 1,2,3&4 ) at 593, 612, 652, and 697 nm. We have examined the dependence of the emission spectra and decay curves on the excitation wavelengths at 228, 246, 259, 361, and 393 nm from a Xe source. Decay curves of the emission transitions have been characterized by a double exponential fitting procedure. From the photoluminescence spectra, concentration quenching at the values of the dopant ion content above 1.0 mol% has been noticed.

Luminescence properties of Nd3+: TeO2–B2O3–P2O5–Li2O glass

Abstract An IR transmitting circular glass window of Nd 3+ -doped borophosphate–tellurite system in the following chemical composition (mol%) was prepared: 65TeO 2 +12B 2 O 3 +12P 2 O 5 +10Li 2 O+1Nd 2 O 3 . For this Nd 3+ -doped (heavy metal glass) optical material, besides the determination of density and refractive indices, an absorption spectrum (350–3200 nm) at 300 K was obtained. Based on the estimated refractive indices ( n F , n d and n C ) at three different wavelengths (486.1, 589.1 and 656.3 nm), the glass dispersive power ( v d ) and non-linearity characteristic factors ( n 2 , γ ) were examined. Parameterization of the elastic constants of this glass was done from the measurement of longitudinal and shear velocities. From the measured absorption band positions, energy level structure ( E k ,F k ,ξ 4 f ,α,β,γ, β and δ %) parameters and from the recorded spectral profiles, oscillator strengths were computed. Both the measured and computed band energies are correlated satisfactorily with an rms deviation of ±89 cm −1 . By applying the Judd–Ofelt parameterization, the radiative ( A , A T , T R ) factors of the luminescent transitions ( 4 F 3/2 → 4 I 13/2,11/2,9/2 ) of the glass were evaluated. Temperature dependent luminescence spectral analyses were carried out in the temperature range of 10–300 K to understand the fluorescence efficiency of a prominent lasing transition ( 4 F 3/2 → 4 I 11/2 ) at 1.06 μm and for the other two transitions ( 4 F 3/2 → 4 I 9/2 , I 13/2 ) at 0.89 and 1.33 μm as well.

Absorption and photoluminescence spectra of Sm3+:TeO2–B2O3–P2O5–Li2O glass

Abstract This short communication reports the optical properties of Sm 3+ -doped 65TeO 2 + 12B 2 O 3 + 12P 2 O 5 + 10Li 2 O glass based on the spectrophotometric profiles of absorption (300 K) and fluorescence (300 and 10 K) spectra.

Emission properties of Tb3+-doped zinc boro-silicate glasses

Abstract This paper reports the optical analysis of terbium-doped zinc boro-silicate glasses from the measurement of photoluminescence spectra and lifetimes of the emission transitions. Dependence of fluorescence performance on the terbium ion concentration has been examined. Physical and non-linearity properties have also been investigated based on the refractive indices ( n C , n d , n F ) obtained at three different wavelengths ( λ C =656.3 nm, λ d =589.3 nm, λ F =486.1 nm). Stimulated emission cross-sections ( σ p E ) for the measured emission peaks of terbium glass are also reported here.

Fluorescence spectra of Cu+: ZnO-B2O3-SiO2 glass

Abstract This short paper brings out an analysis on the fluorescence spectral properties of Cu + ions in a zinc borosilicate glass. A strong emission peak at 500 nm has been observed upon excitation with 296, 310 and 360 nm based on the measured excitation spectrum of this phosphorescent copper glass. This greenish blue broader luminescent transition has been due to a spin forbidden transition ( 3 E g → 1 A g ) showing significant changes in its lifetime (ms) values depending upon the excitation wavelength used.

LUMINESCENCE PROPERTIES OF Eu3+ DOPED ZnO-B2O3-SiO2 GLASSES

ABSTRACT This short paper summarizes the preparation and optical characterization of the Eu3+ (X=0.2,0.5,1.0,1.5 & 2.0 mol%) doped 60ZnO+20B2O3+(20-X) SiO2 glasses from the measurement of their excitation and luminescence spectra at the room temperature. Dependence of red emission performance upon the excitation wavelengths in the UV to near visible range has been investigated and it has been observed that these optical glasses display bright red emission at λ ex=395 nm with the three excitation wavelengths (λ ex= 395 nm, 380 nm and 362 nm) used. The concentration quenching phenomenon has been observed after a particular value of the dopant europium ions availability (beyond 1 mol%) in the glass matrices studied and hence the presence of 1 mol% of Eu3+ in the glass composition has been chosen as the ideal content for achieving brighter red fluorescence performance. Besides carrying out their luminescence study, different physical properties such as refractive index, density, other related factors from these two quantities and also non-linearity properties of these glasses are reported in this paper.

Luminescence properties of Tb3+-doped PbO–Bi2O3–GeO2 glasses

Abstract This paper reports the luminescence properties of (13− x )(PbO–25Bi 2 O 3 –62GeO 2 ) glasses doped with Tb 3+ ions ( x =0.2, 0.5, 1.0, 1.5 and 2.0 mol%) which have been investigated upon excitation at λ ex =248, 261, 352, 370 and 380 nm, respectively. At excitation wavelength 370 nm, 1 mol% of Tb 3+ glass has shown an intense green emission and the photoluminescence spectral features have been analysed.

Fluorescence Spectra of Tb3+: Ln2O2S Powder Phosphors

Abstract The photoluminescence spectra of Tb3+ doped lanthanide oxysulfides (Y2O2S, La2O2S and Gd2O2S) powder phosphors are reported. These phosphors display bright fluorescent green under a UV source. The colour emission richness has been understood by computing the colour co-ordinates ([Xbar],[Ybar]). From their recorded photoluminescence spectra, the relative fluorescence intensity ratios have also been determined to examine the host material effects.

Spectral properties of Eu3+: B2O3-P2O5-R2SO4 glasses

Abstract This paper reports the synthesis of three europium glasses in the composition 44.5B 2 O 3 + 44.5P 2 O 5 + 10R 2 SO 4 (where R = Li, Na and K). For these optical glasses, physical and non-linearity property parameters have been computed from their densities and refractive indices at three different wavelengths (656.3, 589.3 and 486.1 nm), respectively. On excitation with 395 nm (Xe-Arc lamp radiation) these Eu 3+ glasses were found to be red fluorescent and the richness of the red colour was high in the Li + -glass compared to the Na + and K + glass systems. The radiative properties of the fluorescent transitions of the Eu 3+ -glasses can be understood by correlating the measured photoluminescence spectra with the Judd-Ofelt intensity factors obtained from the recorded absorption spectra.