SEMICONDUCTOR LIGHT EMITTING DEVICE, BACKLIGHT, COLOR IMAGE DISPLAY DEVICE AND PHOSPHOR TO BE USED FOR THEM
First Claim
1. A semiconductor light emitting device comprising a solid light emitting device to emit light in a blue or deep blue region or in an ultraviolet region and phosphors, in combination, wherein said phosphors comprise a green emitting phosphor having at least one emission peak in a wavelength region of from 515 to 550 nm and a red emitting phosphor having at least one emission peak with a half-value width of at most 10 nm in a wavelength region of from 610 to 650 nm;
- said red emitting phosphor has substantially no excitation spectrum in the emission wavelength region of said green emitting phosphor and comprises Mn4+ as an activated element; and
said green emitting phosphor and said red emitting phosphor have the variation rate of the emission peak intensity at 100°
C. to the emission intensity at 25°
C. of at most 40%, when the wavelength of the excitation light is 400 nm or 455 nm.
5 Assignments
0 Petitions
Accused Products
Abstract
To provide a semiconductor light emitting device which is capable of accomplishing a broad color reproducibility for an entire image without losing brightness of the entire image.
A light source provided on a backlight for a color image display device has a semiconductor light emitting device comprising a solid light emitting device to emit light in a blue or deep blue region or in an ultraviolet region and phosphors, in combination. The phosphors comprise a green emitting phosphor and a red emitting phosphor. The green emitting phosphor and the red emitting phosphor are ones, of which the rate of change of the emission peak intensity at 100° C. to the emission intensity at 25° C., when the wavelength of the excitation light is 400 nm or 455 nm, is at most 40%.
-
Citations
22 Claims
-
1. A semiconductor light emitting device comprising a solid light emitting device to emit light in a blue or deep blue region or in an ultraviolet region and phosphors, in combination, wherein said phosphors comprise a green emitting phosphor having at least one emission peak in a wavelength region of from 515 to 550 nm and a red emitting phosphor having at least one emission peak with a half-value width of at most 10 nm in a wavelength region of from 610 to 650 nm;
- said red emitting phosphor has substantially no excitation spectrum in the emission wavelength region of said green emitting phosphor and comprises Mn4+ as an activated element; and
said green emitting phosphor and said red emitting phosphor have the variation rate of the emission peak intensity at 100°
C. to the emission intensity at 25°
C. of at most 40%, when the wavelength of the excitation light is 400 nm or 455 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- said red emitting phosphor has substantially no excitation spectrum in the emission wavelength region of said green emitting phosphor and comprises Mn4+ as an activated element; and
-
17. A phosphor comprising a crystal phase having a chemical composition represented by the following formula (1′
- ), wherein the proportion of Mn based on the total mols of MIV′
and Mn is at least 0.1 mol % and at most 40 mol %, and the specific surface area is at most 1.3 m2/g;
MI′
2MIV′
F6;
R
(1′
),wherein MI′
is at least one element selected from the group consisting of K and Na, MIV′
is at least one metal element selected from the group consisting of Groups 4 and 14 of the Periodic Table comprising at least Si, and R is an activated element comprising at least Mn.- View Dependent Claims (18, 19, 20, 22)
- ), wherein the proportion of Mn based on the total mols of MIV′
-
21. A process for producing a phosphor comprising a crystal phase having a chemical composition represented by the following formula (1′
- ), comprising mixing at least two types of solutions each comprising at least one element selected from the group consisting of K, Na, Si, Mn and F;
MI′
2MIV′
F6;
R
(1′
),wherein MI′
is at least one element selected from the group consisting of K and Na, MIV′
is at least one metal element selected from the group consisting of Groups 4 and 14 of the Periodic Table comprising at least Si, and R is an activated element comprising at least Mn.
- ), comprising mixing at least two types of solutions each comprising at least one element selected from the group consisting of K, Na, Si, Mn and F;
Specification