Electroluminescence properties of rare-earth-activated SrS thin films under light irradiation

Tanaka, Isao; Izumi, Yoshitaka; Tanaka, Katsu; Inoue, Yoji; Okamoto, Satoru

doi:10.1016/s0022-2313(99)00591-8

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…After the residue had been at Ϫ30 ЊC for a few days, some solid, tentatively formulated as 1, formed; this was isolated by filtration, and dried in vacuo. 1 H NMR (300 MHz, C 6 D 6 ): δ 2.66 (s, 1 H), 0.72 (s, 3 H).…”

Section: Preparationsmentioning

confidence: 99%

“…Cerium has a relatively stable tetravalent state as far as inorganic compounds, such as CeO 2 , are concerned and so the synthesis and handling of its trivalent organic compounds is often considerably -sometimes prohibitively -more demanding than is the case for any of the other lanthanides. This would be a minor problem were it not for the fact that cerium has been shown to be an excellent dopant in the synthesis of luminescent SrS thin films, 1 and so there is a demand for new (preferably oxygen-free) 2 molecular precursors. Similar requirements are commonly satisfied by dithiocarbamato complexes (from here on, "dithiocarbamato" refers specifically to a dialkyl dithiocarbamato ligand), but this has not been an option in the case of cerium, as there are to the best of our knowledge no known neutral homo-or heteroleptic cerium dithiocarbamates.…”

Section: Introductionmentioning

confidence: 99%

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Cerium(iii) dialkyl dithiocarbamates from [Ce{N(SiMe₃)₂}₃] and tetraalkylthiuram disulfides, and [Ce(κ²-S₂CNEt₂)₄] from the Ce^IIIprecursor; Tb^IIIand Nd^IIIanalogues

et al. 2004

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The synthesis and characterisation of the first neutral cerium dialkyl dithiocarbamate complexes, using a novel oxidative displacement of the amido ligands of [Ce[N(SiMe3)2]3] by tetraalkylthiuram disulfides [R2NC(S)S]2(R = Me, Et) in thf solution, are reported. In the absence of other donors, the complexes [Ce(kappa2-S2CNMe2)3(thf)2] and Ce(kappa2-S2CNEt2)3) 3 were obtained. The addition of a polypyridyl ligand allowed easy access to a range of complexes of general formula [Ce(kappa2-S2CNR2)3(L[intersection]L)][R = Me and L([intersection])L = 2,2'-bipy (4), or 4,7-diphenyl-1,10-phenanthroline (6); or R = Et and L[intersection]L = 2,2'-bipy (5)]. Brief exposure of the Ce(III) dithiocarbamate to oxygen gas afforded in high yield the diamagnetic, crystalline Ce(IV) dithiocarbamate [Ce(kappa2-S2CNEt2)4)] 7. The neodymium (8) and terbium (10) complexes, isoleptic with 2, were prepared from the appropriate 4f metal (Ln) bis(trimethylsilyl)amide [Ln[pN(SiMe3)2]3][Ln = Nd or Tb (9)] and [Me2NC(S)S]2. The structures of the crystalline complexes, 2, 4, 6, 7, 9 and 10 have been determined by X-ray crystallography. Some evidence has been obtained for the formation of the cerium(IV) complex Ce[N(SiMe3)2]2(kappa2-S2CNMe2)2. The cerium(IV) complex 7 has the metal coordinated to eight sulfur atoms of four planar chelating S2CNC2 moities and its geometry is intermediate between dodecahedral and square prismatic; the mean Ce-S bond length of 2.803 A in 7 compares with the 2.950 A in the Ce(III) complex 2.

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Section: Preparationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cerium(iii) dialkyl dithiocarbamates from [Ce{N(SiMe₃)₂}₃] and tetraalkylthiuram disulfides, and [Ce(κ²-S₂CNEt₂)₄] from the Ce^IIIprecursor; Tb^IIIand Nd^IIIanalogues

et al. 2004

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“…The lack of a blue phosphor with suitable color coordinates, high enough luminance and efficiency was one of the main difficulties to commercialize full color devices. These last years, binary and ternary sulfide phosphors have been investigated, like SrS:Ce, 1 ͑Ca,Sr͒Ga 2 S 4 :Ce, 2 SrS:Cu, 3 SrS:Cu,Ag, 4 and CaS:Pb. 5 Unfortunately, not one of these phosphors provides suitable performances for full-color display application.…”

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confidence: 99%

Radiative Properties of the Blue BaAl[sub 2]S[sub 4]:Eu[sup 2+] Phosphor

Barthou

Jabbarov

Bénalloul

et al. 2006

J. Electrochem. Soc.

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The optical properties of BaAl 2 S 4 doped with Eu 2+ were investigated. The synthesis was performed in evacuated and sealed quartz ampul at 1000°C during 1 h, then at 840°C during 20 h. With absorption, excitation, and emission spectra we have determined the crystal-field splitting, the redshift, the influence of the lattice vibration properties, and the thermal quenching of the luminescence. The crystal-field splitting of Eu 2+ in BaAl 2 S 4 was estimated on the order of 8000 to 10 000 cm −1 and the Huang-Rhys parameter S = 5 ± 1 corresponds to an intermediate electron-phonon coupling regime. The mean phonon energy for BaAl 2 S 4 was evaluated by optical and Raman methods, and the obtained values were 32 ± 5 and 40 meV, respectively. These results confirm the very interesting properties of this blue BaAl 2 S 4 :Eu 2+ phosphor, the most important being the very slight thermal quenching of the luminescence.Inorganic thin-film electroluminescent ͑iEL͒ devices are expected to be very interesting candidates for full-color flat display panels. The lack of a blue phosphor with suitable color coordinates, high enough luminance and efficiency was one of the main difficulties to commercialize full color devices. These last years, binary and ternary sulfide phosphors have been investigated, like SrS:Ce, 1 ͑Ca,Sr͒Ga 2 S 4 :Ce, 2 SrS:Cu, 3 SrS:Cu,Ag, 4 and CaS:Pb. 5 Unfortunately, not one of these phosphors provides suitable performances for full-color display application.A breakthrough was made by Miura et al. in 1999, who have reported on a new thin-film blue EL phosphor, BaAl 2 S 4 doped with Eu 2+ , which gives a higher brightness of 65 cd/m 2 at 50 Hz and good color coordinates, x = 0.12 and y = 0.10. 6 Greater brightness than 700 cd/m 2 at 120 Hz has been obtained using the thick dielectric technology at iFire Company. 7 This performance allows iFire Company to announce a full-color 34-in. iEL HDTV screen for the 2006 timeframe using the Color-By-Blue ͑CBB͒ technique. 8 The first report concerning this BaAl 2 S 4 :Eu 2+ phosphor was presented by Donohue and Hanlon. 9 The cubic structure with a lattice parameter of 1.2588 nm was established. At 300 K, a blue band emission peaked at 475 nm was obtained with a decay time on the order of 0.45 s. In this pioneering paper, it was pointed that this phosphor will be efficient due to a wide bandgap leading to a low interaction between the excited states of Eu 2+ and fundamental edge. This cubic structure was summarized by Eisenmann et al. 10 and some luminescence properties were presented by Le Thi et al. 11 The radiative mechanisms of this BaAl 2 S 4 :Eu 2+ phosphor are not completely understood and their fundamental knowledge needs to be enlarged. In this paper diffuse reflectance, excitation, and emission spectra, and photoluminescence ͑PL͒ decay curves of powder samples were analyzed and the influence of temperature on the luminescence process was investigated. The results are discussed in regards to the results recently presented for BaGa 2 S 4 :Eu 2+ phosphor, 12 which h...

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Crystallographic and luminescent characterizations of blue-emitting BaAl2S4:Eu electroluminescent thin films

Tanaka¹,

Inoue²,

Tanaka³

et al. 2002

Journal of Luminescence

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Electroluminescence properties of rare-earth-activated SrS thin films under light irradiation

Cited by 6 publications

References 5 publications

Cerium(iii) dialkyl dithiocarbamates from [Ce{N(SiMe₃)₂}₃] and tetraalkylthiuram disulfides, and [Ce(κ²-S₂CNEt₂)₄] from the Ce^IIIprecursor; Tb^IIIand Nd^IIIanalogues

Cerium(iii) dialkyl dithiocarbamates from [Ce{N(SiMe₃)₂}₃] and tetraalkylthiuram disulfides, and [Ce(κ²-S₂CNEt₂)₄] from the Ce^IIIprecursor; Tb^IIIand Nd^IIIanalogues

Radiative Properties of the Blue BaAl[sub 2]S[sub 4]:Eu[sup 2+] Phosphor

Crystallographic and luminescent characterizations of blue-emitting BaAl2S4:Eu electroluminescent thin films

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Electroluminescence properties of rare-earth-activated SrS thin films under light irradiation

Cited by 6 publications

References 5 publications

Cerium(iii) dialkyl dithiocarbamates from [Ce{N(SiMe3)2}3] and tetraalkylthiuram disulfides, and [Ce(κ2-S2CNEt2)4] from the CeIIIprecursor; TbIIIand NdIIIanalogues

Cerium(iii) dialkyl dithiocarbamates from [Ce{N(SiMe3)2}3] and tetraalkylthiuram disulfides, and [Ce(κ2-S2CNEt2)4] from the CeIIIprecursor; TbIIIand NdIIIanalogues

Radiative Properties of the Blue BaAl[sub 2]S[sub 4]:Eu[sup 2+] Phosphor

Crystallographic and luminescent characterizations of blue-emitting BaAl2S4:Eu electroluminescent thin films

Contact Info

Product

Resources

About

Cerium(iii) dialkyl dithiocarbamates from [Ce{N(SiMe₃)₂}₃] and tetraalkylthiuram disulfides, and [Ce(κ²-S₂CNEt₂)₄] from the Ce^IIIprecursor; Tb^IIIand Nd^IIIanalogues

Cerium(iii) dialkyl dithiocarbamates from [Ce{N(SiMe₃)₂}₃] and tetraalkylthiuram disulfides, and [Ce(κ²-S₂CNEt₂)₄] from the Ce^IIIprecursor; Tb^IIIand Nd^IIIanalogues