Luminescent properties of ZnS:Ce, Li

Kawai, H.; Yokono, S.; Abe, Toru; Hoshina, Takuya

doi:10.1016/0022-2313(81)90243-x

Cited by 11 publications

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References 6 publications

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“…The PL spectrum exhibits weak Ce 3+ emission band with its doublet maxima at 465 nm and 512 nm due to two parityallowed transition of 2 D(5d) → 2 F 7/2 (4f) and 2 F 5/2 (4f) as a result of spin -orbit coupling. 20 This was confirmed by Gaussian curve fit analysis of the spectrum showing two maximum with the frequency difference of about 2000 cm −1 (Figure 6b). It has been reported that ZnS:Ce without Li + emits green luminescence with peak wavelength of 510 nm with poor brightness.…”

Section: Photoluminescence Of Sio 2 Uncapped and Capped Ce LI Mn Dope...supporting

confidence: 59%

“…It has been reported that ZnS:Ce without Li + emits green luminescence with peak wavelength of 510 nm with poor brightness. 20,21 Okamoto and coworkers 30 studied the addition of coactivators such as Y 3+ , Ga 3+ , La 3+ , Al 3+ , In 3+ and Na + in ZnS: Ce 3+ . The result shows the blueshift of the peak wavelength from 510 nm to 450 nm.…”

Section: Photoluminescence Of Sio 2 Uncapped and Capped Ce LI Mn Dope...mentioning

confidence: 99%

“…In specific, the ZnS:Ce, Li exhibits strong band edge absorption at 340 nm and the Ce 3+ emission band with peak at 478 nm and 520 nm measured at LN 2 condition. 20 In general, the fluorescence of Ce 3+ in solids are realized by two parity -allowed transitions of 2 D (5d) -2 F 5/2 , 2 F 7/2 (4f) with the frequency separation of 2000 -2200 cm −1 between them. 21 The energy difference between the two transitions arises due to the spin -orbit splitting of the 4f ground state energy level whose values are independent of the host matrices.…”

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“…21 The energy difference between the two transitions arises due to the spin -orbit splitting of the 4f ground state energy level whose values are independent of the host matrices. Kawai et al 20 has z E-mail: thiyagarajan03@gmail.com identified various complex centers involving RE 3+ and charge compensating ions in II -VI compounds. The occurrence of structure less emission band of Ce 3+ makes it difficult to interpret the atomic nature of the centers.…”

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White Luminescence of Amorphous SiO₂Capped and Uncapped Zn_1-m-nS: Ce_0.0005, Li_0.0005, Mn_n(1 < n < 0.01)mol% Phosphors for Solid State Lighting

Thiyagarajan

Sivakami

Rao

2014

ECS J. Solid State Sci. Technol.

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White luminescence from Zn1-m-nS:Ce0.0005,Li0.0005,Mnn(0.01 < n < 0.0001 mol) phosphors with and without capping of amorphous SiO2 is being reported. The phosphor was prepared by solid state method at the calcination temperature of 950°C, 1020°C and 1080°C, for 5 h in carbon reducing atmosphere. Amorphous SiO2 capping was done on the heat treated phosphors using sol-gel chemical method subsequently calcined at 650°C in carbon reducing atmosphere for 5 h. The Mn content varied from 0.01 mol to 0.0001 mol at fixed Ce3+0.0005 to optimize Ce3+ (450 nm and 520 nm) and Mn2+ (582 nm) emission originates due to electronic transition from (2T2g) 5d – 4f (2F5/2, 2F7/2) and 3d5 (4G (4T1) – 6S (6A1)), respectively. The addition of Li+ with Ce3+ introduce vacancies and different kinds of Ce3+ centers which make it difficult to interpret the structure less emission band of Ce3+ centers. Host band tuning was observed as a function of Mn2+ content. The phosphor shows white light, as confirmed by the CIE chromaticity coordinates (0.300, 0.295).

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Section: Photoluminescence Of Sio 2 Uncapped and Capped Ce LI Mn Dope...supporting

confidence: 59%

Section: Photoluminescence Of Sio 2 Uncapped and Capped Ce LI Mn Dope...mentioning

confidence: 99%

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confidence: 99%

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White Luminescence of Amorphous SiO₂Capped and Uncapped Zn_1-m-nS: Ce_0.0005, Li_0.0005, Mn_n(1 < n < 0.01)mol% Phosphors for Solid State Lighting

Thiyagarajan

Sivakami

Rao

2014

ECS J. Solid State Sci. Technol.

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“…In fact, the luminescent property has barely improved in this regard so far. Note that by using Li + -charge compensator and abrupt thermal quenching, a phosphor ZnS:Ce,Li was made to show a blue-green luminescence with a peak wavelength of 480 nm [1,2]. However, this luminescent chromaticity was still not sufficient as a blue primary chromaticity.…”

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Luminescent properties of ZnS:Ce,Y phosphor

Okamoto¹,

Tanaka²

2006

Phys. Status Solidi (c)

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The ZnS:Ce phosphor together with a co-activator Y 3+ ion shows a bright saturated blue luminescence whose spectrum is a band with a peak wavelength of 450 nm. The chromaticity coordinates are x=0.15 and y=0.09, and thus this phosphor would be good for the blue primary color in displays and light sources. The blue luminescence is due to the 5d-4f internal transition of the Ce 3+ ion.1 Introduction The Ce 3+ ion is an attractive luminescent center for phosphors because it shows visible-to-ultraviolet luminescence that would be applicable for displays and light sources. Furthermore, the luminescence originates from the 5d-4f allowed transition, which is advantageous in terms of luminance and efficiency. However, when the ion is activated with zinc sulfide (ZnS), which is the most popular host material for phosphors, its green luminance (peak wavelength of 510 nm) is too low for practical purposes of using it in color displays and light sources. The reason for this behaviour has been thought to be that Ce 3+ ions are hard to substitute for Zn 2+ ions because their radius and valence are larger than those of Zn 2+ ions. In fact, the luminescent property has barely improved in this regard so far. Note that by using Li + -charge compensator and abrupt thermal quenching, a phosphor ZnS:Ce,Li was made to show a blue-green luminescence with a peak wavelength of 480 nm [1,2]. However, this luminescent chromaticity was still not sufficient as a blue primary chromaticity.Our motivation was thus to make a suitable blue phosphor with a Ce 3+ ion as a luminescent center, and we have found that by using a Y 3+ ion co-activator, we could make the phosphor ZnS:Ce,Y emit a saturated blue luminescence. This paper reports on the intensive effect of the Y 3+ ion on the blue shift from the green luminescence for ZnS:Ce.

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Zinc sulfide (ZnS) phonon dispersion

Landolt-Börnstein - Group III Condensed Matter

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Luminescent properties of ZnS:Ce, Li

Cited by 11 publications

References 6 publications

White Luminescence of Amorphous SiO₂Capped and Uncapped Zn_1-m-nS: Ce_0.0005, Li_0.0005, Mn_n(1 < n < 0.01)mol% Phosphors for Solid State Lighting

White Luminescence of Amorphous SiO₂Capped and Uncapped Zn_1-m-nS: Ce_0.0005, Li_0.0005, Mn_n(1 < n < 0.01)mol% Phosphors for Solid State Lighting

Luminescent properties of ZnS:Ce,Y phosphor

Zinc sulfide (ZnS) phonon dispersion

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Luminescent properties of ZnS:Ce, Li

Cited by 11 publications

References 6 publications

White Luminescence of Amorphous SiO2Capped and Uncapped Zn1-m-nS: Ce0.0005, Li0.0005, Mnn(1 < n < 0.01)mol% Phosphors for Solid State Lighting

White Luminescence of Amorphous SiO2Capped and Uncapped Zn1-m-nS: Ce0.0005, Li0.0005, Mnn(1 < n < 0.01)mol% Phosphors for Solid State Lighting

Luminescent properties of ZnS:Ce,Y phosphor

Zinc sulfide (ZnS) phonon dispersion

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White Luminescence of Amorphous SiO₂Capped and Uncapped Zn_1-m-nS: Ce_0.0005, Li_0.0005, Mn_n(1 < n < 0.01)mol% Phosphors for Solid State Lighting

White Luminescence of Amorphous SiO₂Capped and Uncapped Zn_1-m-nS: Ce_0.0005, Li_0.0005, Mn_n(1 < n < 0.01)mol% Phosphors for Solid State Lighting