Properties of transparent Ce:YAG ceramic phosphors for white LED

Nishiura, Shotaro; Tanabe, Setsuhisa; Fujioka, Kana; Fujimoto, Yasushi

doi:10.1016/j.optmat.2010.06.005

Cited by 505 publications

(210 citation statements)

References 6 publications

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“…It is clear that the spectra of all films show similar outline, indicating that the silicone and substrate do not affect the properties of excitation and emission of the Ce 3+ ion in YAG. [17][18][19][20][21] The emission intensity of fluorescent film gradually increases with the mesh number decreasing from 400 to 200. The intensity values of the excitation/emission spectra for the films printed with 300 and 350 meshes are closed.…”

Section: Resultsmentioning

confidence: 99%

Optical properties of flexible fluorescent films prepared by screen printing technology

Chen

et al. 2018

AIP Advances

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In this work, we prepared a fluorescent film comprised phosphors and silicone on flexible polyethylene terephthalate (PET) substrate using a screen printing technology. The effects of mesh number and weight ratio of phosphors to silicone on the optical properties of the flexible films were investigated. The results indicate that the emission intensity of the film increase as the mesh decreased from 400 to 200, but the film surface gradually becomes uneven. The fluorescent film with high emission intensity and smooth surface can be obtained when the weight ratio of phosphor to gel is 2:1, and mesh number is 300. The luminous efficiency of the fabricated LEDs combined the fluorescent films with 460 nm Ga(In)N chip module can reach 75 lm/W. The investigation indicates that the approach can be applied in the remote fluorescent film conversion and decreases the requirements of the particle size and the dispersion state of fluorescent materials.

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Section: Resultsmentioning

confidence: 99%

Optical properties of flexible fluorescent films prepared by screen printing technology

Chen

et al. 2018

AIP Advances

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“…Yttrium Aluminum Garnet (YAG, Y 3 Al 5 O 12 ) crystals activated by rare earth ions R 3+ (R=La-Lu) is an active laser system, with applications spanning medical, industrial, military and scientific areas [1].Y 3 Al 5 O 12 attract also attention of researchers as promising materials for light-emitting diodes [2]. The crystal field on the impurity ion doped in such crystal is mainly determined by its closet surroundings-ligands and the ions following them.…”

Section: Introductionmentioning

confidence: 99%

The crystal structure of rare earth impurity centers R3+ in Y3Al5O12: Ab Initio calculations

Chernyshev¹,

Serdcev²,

Петров³

et al. 2017

AIP Conference Proceedings

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Abstract. In this paper we carried out the ab initio calculations of the impurity centers Y 3 Al 5 O 12 : R 3+ (R= La-Lu) by investigation doped crystal structure and its elastic properties. The crystal structure of impurity centers was investigated and the elastic constants of the crystals RE 3 Al 5 O 12 (RE = Y, La-Lu) were calculated. The effect of hydrostatic pressure on the elastic properties of RE 3 Al 5 O 12 (RE = Y, La-Lu) was investigated also. Ab initio calculations were performed in periodic CRYSTAL code within the framework of the MO LCAO approach by using hybrid DFT functionals. The results obtained can be used to interpret experimental data and predict the new properties of YAG: R 3 + laser materials.

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“…With the phosphor conversion method, one or two color LEDs die is used to excite different color phosphors, and then these colors are combined to get the white LEDs. Between them, combining the blue emission from GaN LEDs die and the yellow fluorescence from the phosphors excited by the blue light is a typical method [3]. However, both the conversion efficiency and the color rending index are very low.…”

Section: Introductionmentioning

confidence: 99%

Using Three-Component Hierarchical Structures to Improve the Light Extraction From White Leds Based on Red-Green-Blue Color Mixing Method

Li¹,

Li²,

Kong³

et al. 2017

PIER C

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Abstract-In this work, we present a three-component hierarchical structure to simultaneously improve the red, green, and blue (RGB) light extraction efficiency (LEE) of white light-emitting diodes (LEDs) based on color mixing method. With the help of 3D finite-difference time-domain (FDTD) simulations, the effects of the embedded photonic crystals (PhCs) the normal surface PhCs and the nano-rods on the enhancement of RGB light extraction were investigated. The results were compared with those of the conventional planar LEDs and the normal surface PhCs LEDs over the whole visible spectrum. Results from the simulations demonstrated that the maximum LEE for the hierarchical structures LEDs gave 112%, 327%, and 284% RGB LEE enhancement, respectively, compared to that of the conventional planar LEDs, and achieved 104%, 191%, and 187% RGB LEE enhancement compared to that of LEDs with normal surface PhCs. The emission characteristics of the hierarchical structures LEDs were also revealed in detail by FDTD simulations. The results shown in this paper would do a favor for the design and fabrication of high efficiency LEDs.

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Properties of transparent Ce:YAG ceramic phosphors for white LED

Cited by 505 publications

References 6 publications

Optical properties of flexible fluorescent films prepared by screen printing technology

Optical properties of flexible fluorescent films prepared by screen printing technology

The crystal structure of rare earth impurity centers R3+ in Y3Al5O12: Ab Initio calculations

Using Three-Component Hierarchical Structures to Improve the Light Extraction From White Leds Based on Red-Green-Blue Color Mixing Method

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