Luminescence and energy transfer of Eu3+ or/and Dy3+ co-doped in Sr3AlO4F phosphors with NUV excitation for WLEDs

Bandi, Vengala Rao; Grandhe, Bhaskar Kumar; Woo, Hyun-Joo; Jang, Kiwan; Shin, Dong‐Soo; Yi, Soung Soo; Jeong, Jung-Hyun

doi:10.1016/j.jallcom.2012.05.057

Cited by 103 publications

(16 citation statements)

References 31 publications

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“…An unidentified diffraction peak was observed at 44° which can be attributed to some impurities. This peak was also observed in some of the reported works on oxyfluoride phosphors, which is not related to any of the individual elements of SBASOF:xCe 3+ compound . From the XRD spectra, we can estimate that the unit cell dimensions of the sample with 1 mol% of Ce 3+ are a = b = 6.8804 Å, and c = 11.0210 Å, are in good agreement with some unit cell parameters reported before for similar materials …”

Section: Resultssupporting

confidence: 89%

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Dual color tuning in Ce³⁺‐doped oxyfluoride ceramic phosphor plate for white LED application

et al. 2018

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Ceramic phosphor plates of cerium (Ce3+)‐doped oxyfluoride were fabricated by the solid‐state reaction method. These phosphors exhibit efficient emission, with the novel feature of color tuning by varying both the doping concentration and excitation wavelength. As the Ce3+ concentration increases, the excitation spectrum broadens by a factor of 1.6, and the excitation peak wavelength shifts from 390 to 435 nm, and there is a variation in excitation energy of ~ 10%. Luminescence spectrum of low Ce3+ concentration samples is tuned from blue to green with the change of excitation wavelength. The emission peak exhibits a shift of 58 nm into the red spectral region, varying the Ce3+ concentration from 0.05 to 0.1 mol%; whereas this shift is only 6 nm when Ce3+ content changes from 0.25 to 1 mol%. Photoluminescence (PL) quantum yield has achieved 76%. The crystal structure was examined using X‐ray diffraction to explain its possible influence on the redshift luminescence. A proof of concept of white LED was constructed using a 450 nm blue LED chip with an oxyfluoride phosphor plate, showing a luminous efficacy (LE) of 64 lm/W with a color rendering index of 74.

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Section: Resultssupporting

confidence: 89%

“…Perceptible differences of coordination environments between two Sr Wyckoff sites would result in the Sr 2+ ions ordering when Sr 2+ is substituted by rare‐earth ions or alkaline‐earth ions (Ce 3+ and Ba, in this report), which is expected to lead to tunable luminescence properties …”

Section: Resultsmentioning

confidence: 83%

Dual color tuning in Ce³⁺‐doped oxyfluoride ceramic phosphor plate for white LED application

et al. 2018

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“…Emission color tunability in several rare-earth doped phosphor materials induced via excitation power, [11][12][13] temperature, 14,15 and adjustment of the active ions' concentration combination has been demonstrated by many. 11,16,17 In the past few years, several reports have been devoted to the search for warm-light emission phosphors using combinations of rare-earth doping including Eu 3þ ∕Tb 3þ , Eu 3þ ∕Dy 3þ , Eu 3þ ∕Ce 3þ , Eu 3þ ∕Er 3þ , Tm 3þ ∕Dy 3þ , Tm 3þ ∕Dy 3þ ∕Sm 3þ , [17][18][19][20][21][22][23][24][25][26][27] and in Tb 3þ ∕Dy 3þ -codoped silicate, 28 28 lead-borate, 29 and zinc-phosphate 30 glasses. Bearing that in mind, the search for alternative materials is demanded and fluorogermanate-based glass upsurges as a viable candidate for application in rare-earth doped based upconverters.…”

Section: Introductionmentioning

confidence: 99%

Dy³⁺/Tb³⁺-codoped tunable warm light-emitting fluorogermanate glass phosphor

et al. 2016

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Polychromatic tunable visible light emission in the region of the low correlated color temperature range using Dy 3þ ∕Tb 3þ codoped PbGeO 3 ∶PbF 2 ∶CdF 2 glass phosphor under UV-blue LED light excitation is presented. The glass phosphor was synthesized and the light emission feature was examined under UV-blue (353, 375, 385, and 405 nm) excitation. Emission around 484, 573, 663, and 754 nm due to dysprosium, and 488, 545, 585, 620, and 690 nm owing to terbium ions, was observed and analyzed as a function of the dysprosium and terbium contents and excitation wavelength. The excitation spectrum was examined and showed resonance peaks around 385 nm for the 573-nm emission of Dy 3þ , and 375 nm for the 545 nm of Tb 3þ. Energy-transfer process from Dy 3þ ð 4 F 9∕2 Þ to Tb 3þ ð 5 D 4 Þ was also observed. Results indicated that the polychromatic visible light emitter herein reported produced light possessing tunable color tone via excitation wavelength and ions' mass ratio. The tint of the tunable overall emission resided in the warm region of the white-light boundary of the CIE-1931 chromaticity diagram.

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“…Recently, a family of anion ordered oxyfluorides, Sr 3-x A x MO 4 F (A = Ca, Ba and M = Al, Ga, In), has been utilized as a host material for new luminescent materials [5][6][7][8][9][10]. These materials can be activated in the deep (200-250 nm) and near (300-400 nm) UV regions, and exhibit efficient luminescent properties when doped with rare-earth activators.…”

Section: Introductionmentioning

confidence: 99%

“…These materials can be activated in the deep (200-250 nm) and near (300-400 nm) UV regions, and exhibit efficient luminescent properties when doped with rare-earth activators. The luminescent properties of Eu 3+ -doped Sr 3-x A x MO 4 F phosphors have been reported to show red emission under UV or near-UV excitation, and the photoluminescent (PL) properties and Commission International de I'Eclairage (CIE) values can be tailored by various chemical substitutions [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Enhanced luminescence properties of Sr3−xEuxAlO4−yNyF phosphors

Gao¹,

Meng²,

Zhang³

et al. 2015

Ceramics International

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Luminescence and energy transfer of Eu3+ or/and Dy3+ co-doped in Sr3AlO4F phosphors with NUV excitation for WLEDs

Cited by 103 publications

References 31 publications

Dual color tuning in Ce³⁺‐doped oxyfluoride ceramic phosphor plate for white LED application

Dual color tuning in Ce³⁺‐doped oxyfluoride ceramic phosphor plate for white LED application

Dy³⁺/Tb³⁺-codoped tunable warm light-emitting fluorogermanate glass phosphor

Enhanced luminescence properties of Sr3−xEuxAlO4−yNyF phosphors

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Luminescence and energy transfer of Eu3+ or/and Dy3+ co-doped in Sr3AlO4F phosphors with NUV excitation for WLEDs

Cited by 103 publications

References 31 publications

Dual color tuning in Ce3+‐doped oxyfluoride ceramic phosphor plate for white LED application

Dual color tuning in Ce3+‐doped oxyfluoride ceramic phosphor plate for white LED application

Dy3+/Tb3+-codoped tunable warm light-emitting fluorogermanate glass phosphor

Enhanced luminescence properties of Sr3−xEuxAlO4−yNyF phosphors

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Product

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Dual color tuning in Ce³⁺‐doped oxyfluoride ceramic phosphor plate for white LED application

Dual color tuning in Ce³⁺‐doped oxyfluoride ceramic phosphor plate for white LED application

Dy³⁺/Tb³⁺-codoped tunable warm light-emitting fluorogermanate glass phosphor