EP0936682A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Light emitting device and display device
Assignee: Nichia Corp
•
Filing: 1997-07-29
•
Granted: —
•
Expires: 2017-07-29
Abstract
Abstract The white light emitting diode comprising a light emitting component using a semiconductor as a light emitting layer and a phosphor which absorbs a part of light emitted by the light emitting component and emits light of wavelength different from that of the absorbed light, wherein the light emitting layer of the light emitting component is a nitride compound semiconductor and the phosphor contains garnet fluorescent material activated with cerium which contains at least one element selected from the group consisting of Y, Lu, Sc, La, Gd and Sm, and at least one element selected from the group consisting of Al, Ga and In and, and is subject to less deterioration of emission characteristic even when used with high luminance for a long period of time.
Inventors
- 👤 Yoshinori Shimizu
- 👤 Kensho Sakano
- 👤 Yasunobu Noguchi
- 👤 Toshio Moriguchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 22:02
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/85; H10H20/851; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7774; G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0013; G02B6/0023; G02B6/0066; G02B6/0073; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/20; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H10H20/8511; H10H20/8512; G02B6/0025; G02B6/0033; G02B6/005; G02B6/0051; H10H20/8513; H10H20/852; H10H20/854; H10H20/882; H10W; H10W72/00; H10W72/50; H10W72/531; H10W72/536; H10W72/5363; H10W72/551; H10W72/552; H10W72/5522; H10W72/5524; H10W72/5525; H10W72/851; H10W72/874; H10W72/884; H10W74/00; H10W90/00; H10W90/701; H10W90/751; H10W90/756; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
93 words
A light emitting device, comprising a light emitting
component and a phosphor capable of absorbing a part of light
emitted by the light emitting component and emitting light of
wavelength different from that of the absorbed light;
wherein said light emitting component comprises a nitride
compound semiconductor and said phosphor contains a garnet
fluorescent material comprising at least one element selected
from the group consisting of Y, Lu, Se, La, Gd and Sm, and at
least one element selected from the group consisting of Al, Ga
and In, and being activated with cerium.
Claim 2
Dependent Claim
21 words
A light emitting device according to claim 1,
wherein the phosphor used contains an yttrium-aluminum-garnet
fluorescent material containing Y and Al.
Claim 3
Dependent Claim
51 words
A light emitting device according to claim 1,
wherein the phosphor may be a fluorescent material represented
by a general formula (Re 1-r Sm r ) 3 (Al 1-s Ga s ) 5 O 12 :Ce where 0≤r<1 and
0≤s≤1 and Re is at least one selected from Y and Gd.
Claim 4
Dependent Claim
45 words
A light emitting device according to claim 3,
wherein the phosphor contains a fluorescent material
represented by a general formula (Y 1-p-q-r Gd P Ce q Sm r ) 3 (Al 1-s Ga s ) 5 O 12 ,
where 0≤p≤0.8, 0.003≤q≤0.2, 0.0003≤r≤0.08 and 0≤s≤1.
Claim 5
Dependent Claim
29 words
A light emitting device according to claim 2,
wherein the phosphor may contain two or more yttrium-aluminum-garnet
fluorescent materials, activated with cerium, of
different compositions including Y and Al.
Claim 6
Dependent Claim
54 words
A light emitting device according to claim 3,
wherein the phosphor contains two or more fluorescent
materials of different compositions represented by general
formula (Re 1-r Sm r ) 3 (Al 1-s Ga s ) 5 O 12 :Ce where 0≤r<1 and 0≤s≤1 and Re
is at least one selected from Y and Gd.
Claim 7
Dependent Claim
62 words
A light emitting device according to claim 1,
wherein the phosphor may contain a first fluorescent material
represented by general formula Y 3 (Al 1-s Ga s ) 5 O 12 :Ce and a second
fluorescent material represented by general formula Re 3 Al 5 O 12 :Ce,
where 0≤s≤1 and Re is at least one selected from Y, Gd and La.
Claim 8
Dependent Claim
43 words
A light emitting device according to claim 2,
wherein the phosphor may be an yttrium-aluminum-garnet
fluorescent material containing a first fluorescent material
and a second fluorescent material, with each different parts
of yttriums in said first and second fluorescent being
substituted with gadolinium.
Claim 9
Dependent Claim
48 words
A light emitting device according to claim 1,
wherein main emission peak of the light emitting component is
set within the range from 400nm to 530nm and main emission
wavelength of the phosphor is set to be longer than the main
emission peak of the light emitting component.
Claim 10
Dependent Claim
83 words
A light emitting device according to claim 9,
wherein the light emitting layer of the light emitting
component contains a gallium nitride semiconductor containing
In, and the phosphor is an yttrium-aluminum-garnet fluorescent
material wherein a part of Al in the yttrium-aluminum garnet
fluorescent is substituted by Ga so that the proportion of
Ga:Al is within the range from 1:1 to 4:6 and part of Y is
substituted by Gd so that the proportion of Y:Gd is within the
range from 4:1 to 2:3.
Claim 11
Dependent Claim
81 words
A light emitting device according to claim 1, which
comprises a substantially rectangular optical guide plate
being provided with the light emitting component mounted on
one side face thereof via the phosphor and except for one
principal surface being substantially covered with a
reflective material, wherein a light emitted by the light
emitting component is turned into a planar light by the
phosphor and the optical guide plate to be an output from the
principal surface of the optical guide plate.
Claim 12
Dependent Claim
87 words
A light emitting device according to claim 1, which
comprises a substantially rectangular optical guide plate,
being provided with the light emitting component mounted on
one side face thereof and the phosphor installed on one
principal surface thereof and except for the principal surface
being substantially covered with a reflective material,
wherein a light emitted by the light emitting component is
turned into a planar light by the optical guide plate and the
phosphor, to be an output from the principal surface of the
optical guide plate.
Claim 13
Dependent Claim
39 words
An LED display device comprises the light emitting
devices according to one of claims 1 to 10 arranged in a
matrix and a drive circuit which drives the LED display device
according to display data which is input thereto.
Claim 14
Dependent Claim
140 words
A light emitting diode comprising: a mount lead having a cup and a lead; an LED chip mounted in the cup of the mount lead
with one of electrodes being electrically connected to the
mount lead; a transparent coating material filling the cup to
cover the LED chip; and a light emitting diode having a molding material
which covers the LED chip covered with the coating material
including the cup of the mount lead, the inner lead and
another electrode of the LED chip, wherein the LED chip is a nitride compound semiconductor and
the coating material contains at least one element selected
from the group consisting of Y, Lu, Sc, La, Gd and Sm, at
least one element selected from the group consisting of Al, Ga
and In and a phosphor made of garnet fluorescent material
activated with cerium.
Claim 15
Dependent Claim
22 words
A light emitting diode according to claim 14,
wherein the phosphor used contains an yttrium-aluminum-garnet
fluorescent material that contains Y and Al.
Claim 16
Dependent Claim
51 words
A light emitting diode according to claim 14,
wherein the phosphor may be a fluorescent material represented
by a general formula (Re 1-r Sm r ) 3 (Al 1-s Ga s ) 5 O 12 :Ce where 0≤r<1 and
0≤s≤1 and Re is at least one selected from Y and Gd.
Claim 17
Dependent Claim
43 words
A light emitting diode according to claim 14,
wherein the fluorescent material is represented by a general
formula (Y 1-p-q-r Gd P Ce q Sm r ) 3 (Al 1-s Ga s ) 5 O 12 , where 0≤p≤0.8, 0.003≤q≤0.2,
0.0003≤r≤0.08 and 0≤s≤1.
Claim 18
Dependent Claim
28 words
A light emitting diode according to claim 15,
wherein the phosphor contains two or more yttrium-aluminum-garnet
fluorescent materials, activated with cerium, of
different compositions including Y and Al.
Claim 19
Dependent Claim
54 words
A light emitting diode according to claim 16,
wherein the phosphor two or more fluorescent materials of
different compositions represented by a general formula
(Re 1-r Sm r ) 3 (Al 1-s Ga s ) 5 O 12 :Ce, where 0≤r<1 and 0≤s≤1 and Re is at least
one selected from Y and Gd.
Claim 20
Dependent Claim
63 words
A light emitting diode according to claim 14,
wherein the phosphor contains a first fluorescent material
represented by a general formula Y 3 (Al 1-s Ga s ) 5 O 12 :Ce and a second
fluorescent material represented by a general formula
Re 3 Al 5 O 12 :Ce, where 0≤s≤1 and Re is at least one selected from Y,
Gd and La.
Claim 21
Dependent Claim
47 words
A light emitting diode according to claim 18,
wherein the phosphor contains an yttrium-aluminum-garnet
fluorescent material containing a first fluorescent material
and a second fluorescent material wherein a part of yttrium in
the first and second fluorescent materials is substituted with
gadolinium to different degrees of substitution.
Claim 22
Dependent Claim
48 words
A light emitting diode according to claim 14,
wherein main emission peak of the light emitting component is
set within the range from 400nm to 530nm and main emission
wavelength of the phosphor is set to be longer than the main
emission peak of the light emitting component.
Claim 23
Dependent Claim
57 words
A light emitting diode according to claim 1, wherein
main emission peak of the light emitting component is set
within the range from 400nm to 530nm and main emission
wavelength of the phosphor is set to be longer than the main
emission peak of the light emitting component, by which a
white based light can be emitted.
References Cited (Backward Citations)
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