A study on the electroluminescence spectrum of CaS:Sm and CaS:Dy

Pillai, Sandhya; Vallabhan, C. P. G.

doi:10.1002/pssb.2221340148

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…The yellow output arises from the strong emission corresponding to the 4F9~ --* 6H13/2 transition. In these ZnS doped DyCl~ TFEL devices, the transitions of Dy ions observed are similar to those appearing in DyF3-doped ZnS TFEL devices (1) and Dy-doped CaS pho.~',phors (16). ZnS:Er, C/.--The EL emission spectra of our device with ZnS:Er, C1 as the active layer (Fig.…”

Section: El Emission Spectra Of Mis Tfel Device--zns:nd Cl--supporting

confidence: 72%

AC Thin Film Electroluminescent Devices with Rare Earth Doped ZnS

Dr.Jayaraj¹,

Vallabhan²

1991

J. Electrochem. Soc.

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The fabrication of ZnS:Re, C1 thin-film electroluminescent (TFEL) devices and their emission characteristics are described. The various emission bands and lines observed in the spectra are assigned to the transitions within the RE 3~ ions. The operating voltages have been brought down below 50 V using devices with metal-insulator-semiconductor structure, with Sm203 as the insulator. Studies on the effect of halides (F-, CI-, Br-) and oxide (O~) on the EL emission spectra of ZnS:Pr TFEL devices show that the fluoride dopant produces the maximum brightness. The brightest of the ZnS:Re, CI devices studied, ZnS:Tb, C1, has a brightness of about 500 fL, about one-third that of a typical ZnS:Mn EL celt.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.126.162.126 Downloaded on 2015-03-14 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.126.162.126 Downloaded on 2015-03-14 to IP

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Section: El Emission Spectra Of Mis Tfel Device--zns:nd Cl--supporting

confidence: 72%

AC Thin Film Electroluminescent Devices with Rare Earth Doped ZnS

Dr.Jayaraj¹,

Vallabhan²

1991

J. Electrochem. Soc.

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“…A large number of rare earth ions and other metal activators in these hosts produce phosphors having different emission wavelengths ranging from near UV to deep red 7. These are widely used as cathodoluminescent 8, 9, photoluminescent 10, electroluminescent 11, and thermoluminescent 12–14 phosphors. Those applications require a complete understanding of the electronic properties of these materials, especially the band gap.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of the band gap of SrS in GW approximation

Zhu

Zhang

Chen

et al. 2011

Physica Status Solidi (b)

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Using the first-principles pseudopotential method within a local density approximation of the density functional theory (DFT), the structural, electronic properties of SrS in the NaCl(B1) and CsCl(B2) structures have been studied. The calculated lattice parameters, bulk modulus and elastic constants are in excellent agreement with the experiment value and other theoretical value, whereas the minimum gap error is as high as 50.46% in the B1 structure. To get the reliable band gap values of the B1 structure, we employ the GW (G is Green's function and W is the screened Coulomb interaction) approximation method. The result in GW approximation improves the band gap value of the B1 structure greatly and agrees with the value of experimental measurement. And we also predict the band gap value of the B2 structure reliably by GW approximation.

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“…calculations using a small basic set of c.f. levels have been performed for Y 2 O 3 :Dy 3+ [6,7], YAlO 3 :Dy 3+ [8], Dy 2 Ge 2 O 7 [9], elpasolites [10], LiYF 4 :Dy 3+ [11], CaWO 4 :Dy 3+ [12], CaS:Dy 3+ [13], and Dy 3 Ga 5 O 12 [14].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the optical spectra and paramagnetic susceptibility of DyOF

Hölsä

Kestilä

Ylhä

et al. 1996

J. Phys.: Condens. Matter

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The optical absorption spectra of the rhombohedral DyOF were measured at selected temperatures between 9 and 300 K. The emission spectra of the Dy 3+ ion in the LaOF and GdOF matrices were obtained at 77 K and room temperature. The energy level scheme of Dy 3+ (4f 9 electron configuration) was simulated with a Hamiltonian of 20 parameters. The diagonalization of the energy matrices including simultaneously the free ion and crystal field (c.f.) interactions was carried out for the C 3v point symmetry of the RE 3+ site. Good correlation with an rms deviation of 17 cm −1 was obtained between the experimental and calculated energy level schemes of 153 Kramers doublets. The c.f. parameters show only slight distortion from O h symmetry. A comparison to Pr 3+ (4f 2 ), Nd 3+ (4f 3 ), Sm 3+ (4f 5 ), Eu 3+ (4f 6 ), and Tb 3+ (4f 8 electron configuration) in other REOF matrices showed smooth evolution of the c.f. effect which was discussed in terms of the possible interactions involved. The x-ray powder diffraction pattern of DyOF between 6.5 • < 2θ < 120 • was analysed by the Rietveld profile refinement method. The structural data were used to calculate the c.f. parameters by the modified electrostatic point charge model yielding B 4 0 , B 4 3 and B 6 0 values close to the experimental ones, whereas the B 2 0 , B 6 3 , and B 6 6 values were too large. Using the experimental free ion and c.f. wave functions, the paramagnetic susceptibility of DyOF as a function of temperature was simulated. Above the Néel temperature (3.6 K), good agreement was obtained between the calculated and experimental susceptibilities in the paramagnetic range.

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A study on the electroluminescence spectrum of CaS:Sm and CaS:Dy

Cited by 13 publications

References 8 publications

AC Thin Film Electroluminescent Devices with Rare Earth Doped ZnS

AC Thin Film Electroluminescent Devices with Rare Earth Doped ZnS

Theoretical study of the band gap of SrS in GW approximation

Analysis of the optical spectra and paramagnetic susceptibility of DyOF

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