Phosphor and light-generating device
A technology of a light source device and phosphor, applied in the direction of luminescent materials, semiconductor devices, chemical instruments and methods, etc., can solve the problems of reduced luminous efficiency, inability to obtain sufficient white light, and reduced blue transmitted light, and achieve high luminous efficiency.
Pending Publication Date: 2020-11-03
TDK CORPARATION
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Problems solved by technology
[0004] However, the single crystal disclosed in Patent Document 1 is a single crystal produced by the CZ method (Czochralski Method), but there is a problem that sufficient white light cannot be obtained.
[0005] In addition, the segregation coefficient of the Ce concentration of the single crystal produced by the CZ method is about 0.1 to 0.2 (Non-Patent Document 1), and there is also a problem of low uniformity.
[0006] In addition, the transparent polycrystalline ceramic disclosed in Patent Document 2 has a problem of "temperature extinction" in which luminous efficiency decreases at high temperatures.
In addition, the transparent polycrystalline ceramic disclosed in Patent Document 2 also has the problem that blue transmitted light decreases due to scattering at grain boundaries, and cannot sufficiently obtain luminous intensity when used as a light source.
[0007] In addition, the eutectic disclosed in Patent Document 3 has the problem that the blue transmitted light decreases due to scattering at the phase boundary, and cannot obtain sufficient luminous intensity when used as a light source.
Method used
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Embodiment
[0088] Hereinafter, the present invention is explained based on more detailed examples, but the present invention is not limited to these examples.
[0089] (Sample No. 1 to 6)
[0090] use figure 1 The shown single crystal production apparatus 2 produced a Ce:YAG single crystal by the μ-PD method.
[0091] 10 g of a YAG raw material was put into an Ir crucible 4 with an inner diameter of 20 mm as a starting material, and Ce was added as an additive so that the content shown in Table 1 was obtained. The crucible 4 that has been dropped into raw material is dropped into refractory material furnace 6, and the pressure in refractory material furnace 6 is made as decompression atmosphere, makes N 2 Gas at 50cm 3 / min flow for circulation.
[0092] Then, heating of the crucible 4 was started, and the heating was carried out slowly over 1 hour until the melting point of the YAG single crystal was reached. A YAG single crystal is used as the seed crystal 14, and the seed crystal...
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Abstract
The purpose of the present invention is to provide: a phosphor that can have a high Ce content, and thereby obtains a high internal quantum efficiency, can shift the fluorescence wavelength of yellowfluorescence to the long wavelength side, and have a favorable anti-thermal quenching property and excellent blue light transmittance; and a light source device having such phosphor. Provided is a phosphor constituted of Ce:YAG monocrystals containing 0.7 parts by mole or greater of Ce with respect to 100 parts by mole of the combined content of Y and Ce.
Description
technical field [0001] The present invention relates to a phosphor and a light source device using the phosphor. Background technique [0002] A light-emitting device is being studied, which includes: a blue light-emitting diode that emits blue light; and a phosphor that is excited by receiving the blue light from the blue light-emitting diode and emits yellow fluorescence. color transmitted light) mixed with yellow fluorescent light to emit white light (Patent Document 1). [0003] As phosphors, Ce:YAG single crystals (Patent Document 1) or polycrystalline ceramics (Patent Document 2) are mainly used, and Ce:YAG and Al 2 o 3 constituted eutectic (Patent Document 3). [0004] However, the single crystal disclosed in Patent Document 1 is a single crystal produced by the CZ method (Czochralski Method), but there is a problem that sufficient white light cannot be obtained. [0005] In addition, the segregation coefficient of the Ce concentration of the single crystal produc...
Claims
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IPC IPC(8): C09K11/80H01L33/50
CPCH01L33/502C09K11/7721
Inventor 照井达也佐藤真人
Owner TDK CORPARATION