White light generation under violet-blue excitation from tunable green-to-red emitting Ca2MgSi2O7:Eu,Mn through energy transfer

Chang, Chun; Chen, Teng‐Ming

doi:10.1063/1.2722670

Cited by 132 publications

(96 citation statements)

References 11 publications

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“…To solve this problem, red, green, and blue multi-phased phosphors are employed to generate white light under ultraviolet (UV) LED chips excitation. However, blue emission efficiency is low in this three-converter system because of the strong reabsorption of blue light by the red or green phosphors [18]. A large number of researchers have recently reported single-phased phosphors based on UV LED chips, which can avoid the aforementioned problems [20,21].…”

Section: Introductionmentioning

confidence: 99%

“…So far, many methods to realize white light emission were developed [3,17,18]. The most common one is combining a blue-emitting GaN-based semiconductor chip with yellow-emitting phosphor [17][18][19]. However, the difference between the individual degradation rates of the blue LED chip and the phosphors results in chromaticity aberration and poor white light performance [14].…”

Section: Introductionmentioning

confidence: 99%

“…The growing market share of W-LEDs for solid state lighting impelled the great progress of III-Nitride based LEDs [4][5][6][7][8][9][10][11][12][13] and phosphor materials [14][15][16] for W-LEDs. So far, many methods to realize white light emission were developed [3,17,18]. The most common one is combining a blue-emitting GaN-based semiconductor chip with yellow-emitting phosphor [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tunable white light emission from γ-irradiated Ag/Eu co-doped phosphate glass phosphor

Fan¹,

Yu²,

He³

et al. 2012

Opt. Mater. Express

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Abstract:We report a new tunable white light emission from γ-irradiated Ag/Eu co-doped phosphate glass phosphor. The appearance of Eu 2+ and silver aggregates after γ-irradiation was confirmed via Electron paramagnetic resonance (EPR), absorption, and emission spectra. The effects of Ag/Eu doping concentration and excitation wavelengths on white light emission were discussed. A pure white light emission with the chromaticity coordinates (X = 0.331, Y = 0.329) was generated using the optimal sample under excitation at 360 nm.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tunable white light emission from γ-irradiated Ag/Eu co-doped phosphate glass phosphor

Fan¹,

Yu²,

He³

et al. 2012

Opt. Mater. Express

View full text Add to dashboard Cite

show abstract

“…Phosphor materials are also expected to make films at low temperature for surface emitting devices from a demand of heat resistance of substrates. Among many phosphors, white light emitting materials under ultraviolet (UV) light are intensively attracted from the lighting applications such as white light emitting-diodes [1][2][3][4][5][6][7]. Metavanadates, AVO 3 (A: alkaline metal ions), have been reported as white light emitting phosphors by Gobrecht and Heinsohn in 1957 [8].…”

Section: Introductionmentioning

confidence: 99%

Rubidium metavanadate formation at room temperature under vacuum ultraviolet irradiation from metal-organic compositions

Nakajima

Tsuchiya

Kumagai

2009

Applied Surface Science

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“…[1][2][3][4][5] Recently, they have also been applied for the photovoltaic applications to improve solar cell efficiency by better exploitation of the solar spectrum. The down-conversion luminescence process, which converts the high energy part of the solar spectrum into the near-infrared wavelength region that can be efficiently absorbed by the solar cell, has been reported in rare earth codoped systems such as Tb 3+ 3+ , and Pr 3+ act as the absorption centers.…”

mentioning

confidence: 99%

Energy transfer between silicon–oxygen-related defects and Yb3+ in transparent glass ceramics containing Ba2TiSi2O8 nanocrystals

Song

Zhu

Luo

et al. 2008

Applied Physics Letters

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We report on the conversion of near-ultraviolet radiation of 250-350 nm into near-infrared emission of 970-1100 nm in Yb 3+ -doped transparent glass ceramics containing Ba 2 TiSi 2 O 8 nanocrystals due to the energy transfer from the silicon-oxygen-related defects to Yb 3+ ions. Efficient Yb 3+ emission ͑ 2 F 5/2 → 2 F 7/2 ͒ was detected under the excitation of defects absorption at 314 nm. The occurrence of energy transfer is proven by both steady state and time-resolved emission spectra, respectively, at 15 K. The Yb 2 O 3 concentration dependent energy transfer efficiency has also been evaluated, and the maximum value is 65% for 8 mol % Yb 2 O 3 doped glass ceramic. These materials are promising for the enhancement of photovoltaic conversion efficiency of silicon solar cells via spectra modification. © 2008 American Institute of Physics. ͓DOI: 10.1063/1.3021086͔In the past decades, luminescent materials doped with rare earth ions and/or transition metal ions found great applicability in optical telecommunications, mercury-free fluorescent lamps, and lighting lasers.1-5 Recently, they have also been applied for the photovoltaic applications to improve solar cell efficiency by better exploitation of the solar spectrum. The down-conversion luminescence process, which converts the high energy part of the solar spectrum into the near-infrared wavelength region that can be efficiently absorbed by the solar cell, has been reported in rare earth codoped systems such as Tb 3+ 6-9 On the other hand, up-conversion luminescence process has also been investigated to access the low energy part of the solar spectrum since only photons with energy higher than the silicon band gap can be absorbed by the solar cell directly. 10,11 In addition, photoluminescence is also an effective method to improve the solar cell efficiency. This process can reduce the loss originated from imperfect collection by shifting the high energy photons to a low energy range where the solar cell has a higher spectral response. 12To improve the solar cell efficiency, the optimum spectral response we expect is a broad absorption band in the near-ultraviolet region, where the solar cells show poor response, and an emission in the near-infrared region slightly shorter than 1100 nm, where the silicon solar cells exhibit their greatest spectral response. 12,13 It was reported that the glass ceramics containing Ba 2 TiSi 2 O 8 nanocrystals, which has been widely investigated due to its large second-order optical nonlinearity, also exhibits a visible green emission corresponding to a broad excitation band in the nearultraviolet region. The origin of the visible emission is suggested due to the oxygen-deficient defects in the TiO 5 octahedra or the SiO 4 units. [14][15][16] Our present experimental results indicate that the green emission is due to the existence of silicon-oxygen-related defects in the SiO 4 units, yet the introduction of TiO 2 will greatly enhance the emission intensity. In this letter, we demonstrated efficient infrared emission of Yb 3+ ...

show abstract

White light generation under violet-blue excitation from tunable green-to-red emitting Ca2MgSi2O7:Eu,Mn through energy transfer

Cited by 132 publications

References 11 publications

Tunable white light emission from γ-irradiated Ag/Eu co-doped phosphate glass phosphor

Tunable white light emission from γ-irradiated Ag/Eu co-doped phosphate glass phosphor

Rubidium metavanadate formation at room temperature under vacuum ultraviolet irradiation from metal-organic compositions

Energy transfer between silicon–oxygen-related defects and Yb3+ in transparent glass ceramics containing Ba2TiSi2O8 nanocrystals

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