Optical band gap studies on (55−x)Na2O–xPbO–45P2O5 (SLP) glass system

Subrahmanyam, K. S.; Salagram, M.

doi:10.1016/s0925-3467(00)00033-1

Cited by 63 publications

(34 citation statements)

References 5 publications

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“…The Physical and optical parameters such as refractive index(η), density ( single NBOs [17,18]. It is also observed that increase of Na 2 O content considerably shifts the absorption edge to the shorter wavelengths, predominantly due to the creation of less number of NBOs.…”

Section: Resultsmentioning

confidence: 98%

Optical properties of Er3+ doped alkali chlorophosphate glasses for optical amplifiers

et al. 2008

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Section: Resultsmentioning

confidence: 98%

Optical properties of Er3+ doped alkali chlorophosphate glasses for optical amplifiers

et al. 2008

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“…Urbach energy values (ΔE) were calculated by taking the reciprocals of the slopes of linear portion in the lower photon energy region of these curves as stated with relation (4) [24].…”

Section: Synthesis and Optical Characterization Of Silver Doped Sodiumentioning

confidence: 99%

Synthesis and Optical Characterization of Silver Doped Sodium Borate Glasses

Sharma¹,

Singh²,

Mudahar³

et al. 2012

NJGC

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Silver doped sodium borate glasses prepared by melt-quenching technique were checked by XRD technique for their amorphous nature. It is observed that the molar volume increases with increasing Ag 2 O content leading to open structure. Fourier Transform Infrared spectroscopy (FTIR) reveals the formation of BO 3 and BO 4 groups upon addition of silver oxide as modifier. From the Ultraviolet-Visible (UV-VIS) absorption spectra it is seen that the optical band gap increases with the increase of Ag 2 O content. Urbach energy is observed between 0.55 -0.77 eV. The results obtained from molar volume, Fourier Transform Infrared spectroscopy and band gap energy measurements are in agreement with each other and nearly give the similar information about the studied glasses.

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“…As can be seen, the optical band gap energy of glasses decreases from 2.66 to 2.05 eV with increasing Li 2 O content. The origin of E opt is attributed to photonassisted indirect transition [5]. Also introduction of Li 2 O into the network causes the P-O-P and P-O-Mo bonds to be broken and appearing of the NBOs in the network.…”

Section: Infrared Spectramentioning

confidence: 99%

“…where ν is the frequency of the radiation, α 0 is a constant and E e is the width of the tails of the localized states at the band gap that represents the degree of disorder in amorphous semiconductors [23,25,5,30]. Figure 5 shows the relationship of lnα against hν.…”

Section: Infrared Spectramentioning

confidence: 99%

“…Alkali oxides when added to the oxide glasses, act as network modifiers by giving rise to non-bridging oxygens (NBOs) in the structure. The modifiers induce defects and further doping has been found to have a profound effect on a number of physical and chemical properties of glasses [3,5,7]. It is expected that in TMO glasses containing modifier ions, a mixture of ionic and polaronic conduction will exist [8].…”

Section: Introductionmentioning

confidence: 99%

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Optical properties of glasses in the Li2O–MoO3–P2O5 system

Azmoonfar

Hekmatshoar

Mirzayi

et al. 2008

Ionics

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Glasses xLi 2 O-(50-x)(MoO 3 ) 2 -50P 2 O 5 with x= 10, 20, 30, and 40 mol% were prepared and their optical and electrical properties were investigated. Analysis of the IR spectra revealed that the Li + ions act as a glass modifier that enter the glass network by breaking up other linkages and creating non-bridging oxygens in the network. The optical absorption edge of the glasses was measured for specimens in the form of thin blown films and the optical absorption spectra of those were recorded in the range 200-800 nm. From the optical absorption edges studies, the optical band gap (E opt ) and the Urbach energy (E e ) values have been evaluated by following the available semiempirical theories. The linear variation of (αhν) 1/2 with hν, is taken as evidence of indirect interband transitions. The E opt values were found to decrease with increasing Li 2 O content by causing increase in the number of nonbridging oxygens in network. The Urbach tail analysis gives the width of localized states between 0.48 and 0.74 eV.

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Optical band gap studies on (55−x)Na2O–xPbO–45P2O5 (SLP) glass system

Cited by 63 publications

References 5 publications

Optical properties of Er3+ doped alkali chlorophosphate glasses for optical amplifiers

Optical properties of Er3+ doped alkali chlorophosphate glasses for optical amplifiers

Synthesis and Optical Characterization of Silver Doped Sodium Borate Glasses

Optical properties of glasses in the Li2O–MoO3–P2O5 system

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