Ce<sup>3+</sup>-based phosphors for blue LED excitation

Setlur, Anant; Srivastava, A.M.; Comanzo, H.A.; Chandran, Gopi; Aiyer, Hemantkumar N.; Shankar, M. V.; Weaver, Stanton

doi:10.1117/12.529127

Cited by 27 publications

(13 citation statements)

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“…In this case, the Al 2 O 3 phase and Ce 0.09 Y 2.91 Al 5 O 12 phase played important roles as a light‐guide phase and a photoluminescence phase, respectively. Of these, it is well known that a 5 d –4 f transition of Ce 3+ contained in the latter crystalline phase shows a yellow band emission 17,18 …”

Section: Incandescent High‐power White‐ledmentioning

confidence: 99%

“…Of these, it is well known that a 5d-4f transition of Ce 31 contained in the latter crystalline phase shows a yellow band emission. 17,18 Figure 3 shows the intensities of the yellow band (560 nm emission band) emitted from our binary crystal plate (Al 2 O 3 /Ce 0.09 Y 2.91 Al 5 O 12 , volume ratio: 45/55) and a dense plate (powder system) made of commercial YAG:Ce (P46Y3, 55 vol%) and Al 2 O 3 (45 vol%) powders by the excitation of a 460 nm blue band. In this experiment, these samples were set on a mirror and the emission intensities from the samples were measured using an integrated globe.…”

Section: Incandescent High-power White-ledmentioning

confidence: 99%

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Durable, Ultraluminous Structure for Incandescent, High‐Power White‐LED

Ishikawa

Sakata

Mitani

2006

Int J Applied Ceramic Tech

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A new particle‐ and resin‐free system composed of transparent, binary single crystals entangled with each other continuously has been successfully developed for a light source for illumination. These single crystals exist in a semi‐coherent state like a block copolymer; one of these single crystals exhibits effective photoluminescence and the other plays an important role as a light guide of excitation and emitting lights. This material can have low backscattering and high quantum efficiency, resulting in twice the emission light of conventional particle‐dispersed systems. Furthermore, this system shows outstanding durability, because of its thermostructural properties. This concept will be expanded into wide combinations to create incandescent systems in the future.

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Section: Incandescent High‐power White‐ledmentioning

confidence: 99%

Section: Incandescent High-power White-ledmentioning

confidence: 99%

Durable, Ultraluminous Structure for Incandescent, High‐Power White‐LED

Ishikawa

Sakata

Mitani

2006

Int J Applied Ceramic Tech

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“…The role of confinement at nanoscale in quenching of fluorescence is an interesting and important effect. Different mechanisms of thermal quenching of Ce 3+ fluorescence are possible, which may involve energy transfer 11, charge transfer 12, or multiphonon relaxation 5, 13. The comparison of quenching in the samples with different Ce concentrations did not reveal the concentration dependence of quenching (Fig.…”

Section: Resultsmentioning

confidence: 93%

Temperature quenching of Ce³⁺ impurity ion fluorescence in Y₂O₂S: Spatial confinement effect in multiphonon relaxation

Feofilov

Kulinkin

Zakharchenya

et al. 2013

Physica Status Solidi (b)

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The non-radiative decay of the 5d excited state of Ce 3þ ions in Y 2 O 2 S was studied with fluorescence spectroscopy. It is shown that temperature quenching of Ce 3þ ion fluorescence is due to high-order multiphonon relaxation. The direct evidence of spatial confinement effect in multiphonon relaxation was obtained: relaxation is more efficient in nanoparticles than in micron-sized particles. 1 Introduction In insulating nanocrystalline materials doped with rare earth (RE) or transition metal (TM) ions and consisting of ''free-standing'' loosely packed nanocrystalline clusters the electron-phonon interaction of impurity ions contained in the nanoparticles is strongly modified compared to that in the bulk crystals. The rate of electronic relaxation between closely spaced energy levels of ions in small nanoparticles resulting from a single-phonon direct process can experience a significant reduction due to the gap in the acoustic-phonon spectrum at low frequencies [1,2]. In nanoparticles optical dephasing resulting from two-phonon Raman processes can be enhanced and its temperature dependence modified by the confinement of the phonon modes and the alteration in the phonon density of states due to confinement [3,4].In the present study, we address the question of whether the confinement in nanoparticles influences the processes of non-radiative multiphonon relaxation [5] of the excited states of RE impurity ions. Multiphonon relaxation is an important process, which often determines the quantum yield of impurity ion fluorescence. This work is motivated, in part, by the interest in doped nanocrystalline materials for applications such as phosphors and scintillators.

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“…However, there are very few inorganic red or orange phosphors with environmental stability and nontoxicity for near UV based white LEDs. Moreover, Eu 2+ , Mn 2+ co-doped α-Sr 2 P 2 O 7 had been patented as phosphor for generation of white light when blended with other phosphors 9 . Owing to forbidden transition within 3d 5 configuration of Mn 2+ , the Mn 2+ singly doped material generally exhibits weak optical absorption and in turn weak luminescence.…”

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confidence: 99%

Dual Color Emissions of Sr_2−xCa_xP₂O₇: Eu²⁺, Mn²⁺for near UV Excitation

Yu¹,

Hao²,

Zhang³

et al. 2012

J. Electrochem. Soc.

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Eu 2+ , Mn 2+ singly and co-doped Sr 2−x Ca x P 2 O 7 phosphors (x = 0-2) are prepared by solid state reaction. Crystal phase evolution is studied as a function of Ca 2+ content based on the experimental measurements of X-ray diffraction, photoluminescence and fluorescence decay. The x dependent emission band shapes and peak positions for both Eu 2+ and Mn 2+ are discussed in terms of the crystal phase types and crystal field strength in relation with Ca 2+ substitution for Sr 2+ . An effective energy transfer from blue emitting Eu 2+ to orange emitting Mn 2+ is observed in all compositions beneficial to dual color emissions. The widest emission band and intense orange emission are found in Sr 1.25 Ca 0.75 P 2 O 7 : Eu 2+ , Mn 2+ , exhibiting promising use in white light generation using near UV LEDs.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.126.162.126 Downloaded on 2015-03-11 to IP F60 Journal of The Electrochemical Society, 159 (3) F56-F61 (2012) ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.126.162.126 Downloaded on 2015-03-11 to IP

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Ce³⁺-based phosphors for blue LED excitation

Cited by 27 publications

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Durable, Ultraluminous Structure for Incandescent, High‐Power White‐LED

Durable, Ultraluminous Structure for Incandescent, High‐Power White‐LED

Temperature quenching of Ce³⁺ impurity ion fluorescence in Y₂O₂S: Spatial confinement effect in multiphonon relaxation

Dual Color Emissions of Sr_2−xCa_xP₂O₇: Eu²⁺, Mn²⁺for near UV Excitation

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Ce3+-based phosphors for blue LED excitation

Cited by 27 publications

References 0 publications

Durable, Ultraluminous Structure for Incandescent, High‐Power White‐LED

Durable, Ultraluminous Structure for Incandescent, High‐Power White‐LED

Temperature quenching of Ce3+ impurity ion fluorescence in Y2O2S: Spatial confinement effect in multiphonon relaxation

Dual Color Emissions of Sr2−xCaxP2O7: Eu2+, Mn2+for near UV Excitation

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Product

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Ce³⁺-based phosphors for blue LED excitation

Temperature quenching of Ce³⁺ impurity ion fluorescence in Y₂O₂S: Spatial confinement effect in multiphonon relaxation

Dual Color Emissions of Sr_2−xCa_xP₂O₇: Eu²⁺, Mn²⁺for near UV Excitation