Intense red-emitting Y_4Al_2O_9:Eu^3+phosphor with short decay time and high color purity for advanced plasma display panel

Yadav, Ravishanker; Khan, Arshad; Yadav, Ashish; Chander, Harish; Haranath, D.; Gupta, B.; Shanker, Virendra; Chawla, Santa

doi:10.1364/oe.17.022023

Cited by 51 publications

(18 citation statements)

References 29 publications

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“…This explains the observed luminescence decay time in the order of nanoseconds. For the Ce 3þ emission in YAG, decay time is reported to be 10-70 ns [17,18,20] has a much longer decay time (hundreds of microsecond to millisecond) due to forbidden nature of electric dipole transition [21,22] as is observed in the present case. The measured luminescence decay of 610 nm emission for different concentrations of Pr in YAG:Ce,Pr under microsecond pulsed 460 nm excitation is shown in Figure 5(b), the initial part of the decay and its variation with Pr concentration is shown in the inset.…”

Section: Photoluminescencesupporting

confidence: 62%

Red enhanced YAG:Ce, Pr nanophosphor for white LEDs

Chawla¹,

Roy²,

Majumder³

et al. 2012

Journal of Experimental Nanoscience

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Rare earth ion Pr 3þ was co doped in yellow emitting YAG:Ce nanophosphor to introduce red emission for improving colour rendering property of white LED. Nanocrystalline YAG:Ce, YAG:Ce, Pr was synthesised by a single step auto combustion process. Photoluminescence (PL) emission spectra of YAG:Ce, Pr nanophosphor, when excited by 460 nm blue light, exhibited sharp red emission peaks at 610 nm from Pr 3þ ions in addition to broad yellow emission from Ce 3þ peaking at 540 nm due to charge transfer from excited Ce 3þ 5d band to. Ce 3þ (yellow) and Pr 3þ (red) emission decays in tens of nanoseconds and microseconds, respectively. Electroluminescence spectra of blue LED with developed phosphor layer shows colour coordinates (0.30, 0.39) close to ideal white light.

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Section: Photoluminescencesupporting

confidence: 62%

Red enhanced YAG:Ce, Pr nanophosphor for white LEDs

Chawla¹,

Roy²,

Majumder³

et al. 2012

Journal of Experimental Nanoscience

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“…They are a little (a few ms). 26) As the Eu concentration increases, the decay time constants become faster and it is a typical phenomenon in rareearth doped luminescent materials. On the other hand, the selfactivated luminescence emission was 314 ns and it was not observed in Eu-doped samples.…”

Section: Resultsmentioning

confidence: 99%

Scintillation and dosimetric properties of Eu-doped SrCO<sub>3</sub> ceramics prepared by spark plasma sintering method

Nakauchi

Okada

Yanagida

2016

J. Ceram. Soc. Japan

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Eu-doped SrCO 3 (Eu:SrCO 3 ) ceramics are prepared by a spark plasma sintering (SPS) technique. In photoluminescence (PL), emissions around 615 nm due to 4f4f transition of Eu 3+ appear under several excitation wavelengths. The PL decay time constants are 314 ns due to the host and 400600¯s due to Eu 3+ . The X-ray induced scintillation spectra show an intense emission peak and some small bands around 615 nm and scintillation decay time constants are 210224¯s. In thermally stimulated luminescence (TSL) after X-ray irradiation, a strong TSL glow peak is observed in 450°C and TSL intensity increase in association with Eu concentration.

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“…These results are comparable to those reported previously using a variety of host materials for this ion. [41][42][43][44] The cathodo-luminescent (CL) spectra of Al 2 O 3 :Eu 3+ powders, is shown in Fig. 3D.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Al₂O₃: Eu³⁺Powder and PET Films with this Powder Incorporated: A Luminescence Study

Mariscal

Cármona-Téllez²,

Alarcón-Flores³

et al. 2015

ECS J. Solid State Sci. Technol.

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Luminescent properties of Al 2 O 3 :Eu 3+ powder and polyethylene therephtalate (PET) films with this powder incorporated in them are reported. Powders were synthesized by simple evaporation method and the polymeric thin films were made by spray pyrolysis technique using recycled PET as raw material. The phosphors were characterized by cathode and photoluminescence techniques; in both cases, the luminescence spectra peaks observed are associated with inter level transitions within the electronic energy states of Eu 3+ ions ( 5 D 0 to 7 F 1 , 7 F 2 , 7 F 3 y 7 F 4 , located at 590, 616, 650, and 697 nm, respectively). Powders spectra show higher luminescence intensity than those intensities observed for films. The dominant peak intensity is associated with the 5 D 0 to 7 F 2 transition at 616 nm. XRD measurements of the powder phosphors show that they are polycrystalline. PET films are transparent (between 80 and 95%T in the UV-Vis range).In recent years most of the work on the Flat Panel Displays (FPD) area has been focused to the development of metal oxide based luminescent films of high quality, that can be used as optically active layers in photoluminescent, cathodoluminescent and electroluminescent devices, for this purpose it is necessary to obtain flat and transparent films in order to obtain a device with a good resolution, contrast and efficiency characteristics. More recently other properties and characteristics like flexibility, low cost, lightness and environmental friendly have caused an increasing interest.Metal oxides are attractive host materials for rare earth dopants to develop advanced phosphors due to their good stability and easiness to synthesize. 1-3 Trivalent rare-earth doped oxides are some of the most promising phosphors; their 4f n valence clouds are shielded by the 5s 2 p 6 electron cloud and according to this electron configuration, the sharp lines due to the f-f transitions are observed in the optical absorption and emission spectra. 4,5 Among rare earth ions, Eu 3+ ions have attracted significant attention because they have tremendous potential for applications in some optical fields, such as phosphors, electroluminescent devices, and optical amplifiers or lasers. 6-8 In addition, the luminescence of Eu 3+ ions is particularly interesting because the emission corresponding to the 5 D 0 to 7 F 2 transition, centered near 612 nm, provides one of the three fundamental colors (red, blue, and green).Among the materials investigated to date, a few experiments have been performed on rare-earth ion doped aluminum oxide (Al 2 O 3 ). [8][9][10][11][12][13][14] The Al 2 O 3 crystal is a material with a significant technological importance because of the large optical transparency from ultraviolet to near-infrared, and because of its excellent mechanical properties and good chemical stability. Several crystalline phases of Al 2 O 3 are known, the α -Al 2 O 3 is the most stable phase. These rare earth doped Al 2 O 3 materials have been synthesized by techniques such as sol-gel, ion beam implantat...

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Intense red-emitting Y_4Al_2O_9:Eu^3+phosphor with short decay time and high color purity for advanced plasma display panel

Cited by 51 publications

References 29 publications

Red enhanced YAG:Ce, Pr nanophosphor for white LEDs

Red enhanced YAG:Ce, Pr nanophosphor for white LEDs

Scintillation and dosimetric properties of Eu-doped SrCO<sub>3</sub> ceramics prepared by spark plasma sintering method

Synthesis of Al₂O₃: Eu³⁺Powder and PET Films with this Powder Incorporated: A Luminescence Study

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Intense red-emitting Y_4Al_2O_9:Eu^3+phosphor with short decay time and high color purity for advanced plasma display panel

Cited by 51 publications

References 29 publications

Red enhanced YAG:Ce, Pr nanophosphor for white LEDs

Red enhanced YAG:Ce, Pr nanophosphor for white LEDs

Scintillation and dosimetric properties of Eu-doped SrCO<sub>3</sub> ceramics prepared by spark plasma sintering method

Synthesis of Al2O3: Eu3+Powder and PET Films with this Powder Incorporated: A Luminescence Study

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Synthesis of Al₂O₃: Eu³⁺Powder and PET Films with this Powder Incorporated: A Luminescence Study