Phosphor mixture and light emitting device
First Claim
1. A phosphor mixture, which emits a visible light under an excitation of an excitation light of ultraviolet to green color, wherein under the excitation of the excitation light with a wavelength range from 430 nm to 500 nm, a peak value of a relative emission intensity at the temperature of 25°
- C. is defined as P25, and the peak value of the relative emission intensity at the temperature of T°
C. is defined as PT, and when the value of T is changed in a range from 25°
C. to 200°
C., the value of (100×
(P25−
PT)/P25) is within ±
25.
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Accused Products
Abstract
To provide a phosphor mixture realizing a light emitting device having a phosphor and a light emission element, by which light emission is performed, with a small color shift due to a feeding current and having an excellent color rendering properties. CaAlSin3:Eu as a red phosphor and YAG:Ce as a yellow phosphor are manufactured, and emission spectra thereof are obtained. Meanwhile, the emission spectrum of an excitation light emitted by a light emitting part is obtained. From the emission spectra thus obtained, a relative mixing ratio of each phosphor is obtained by simulation, so that a correlated color temperature of the light emitting device becomes a target temperature. Then, based on the relative mixing ratio thus obtained, each phosphor is measured and mixed, and a phosphor mixture is thereby obtained.
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Citations
19 Claims
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1. A phosphor mixture, which emits a visible light under an excitation of an excitation light of ultraviolet to green color, wherein under the excitation of the excitation light with a wavelength range from 430 nm to 500 nm, a peak value of a relative emission intensity at the temperature of 25°
- C. is defined as P25, and the peak value of the relative emission intensity at the temperature of T°
C. is defined as PT, and when the value of T is changed in a range from 25°
C. to 200°
C., the value of (100×
(P25−
PT)/P25) is within ±
25. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- C. is defined as P25, and the peak value of the relative emission intensity at the temperature of T°
Specification