Source: https://patents.google.com/patent/KR101200400B1/en
Timestamp: 2019-11-13 18:20:14
Document Index: 637412019

Matched Legal Cases: ['art.\n2', 'art. 1', 'art 180', 'art 280', 'art 280', 'art 250', 'art 280', 'art 380', 'art 380', 'art 350', 'art 380', 'art 380']

KR101200400B1 - White light emitting diode - Google Patents
KR101200400B1
KR101200400B1 KR1020050116520A KR20050116520A KR101200400B1 KR 101200400 B1 KR101200400 B1 KR 101200400B1 KR 1020050116520 A KR1020050116520 A KR 1020050116520A KR 20050116520 A KR20050116520 A KR 20050116520A KR 101200400 B1 KR101200400 B1 KR 101200400B1
KR1020050116520A
KR20070058185A (en
2005-12-01 Priority to KR1020050116520A priority Critical patent/KR101200400B1/en
2007-06-08 Publication of KR20070058185A publication Critical patent/KR20070058185A/en
2012-11-16 Publication of KR101200400B1 publication Critical patent/KR101200400B1/en
The present invention relates to a white light emitting diode, comprising a molding portion for encapsulating a blue light emitting diode chip, a green light emitting diode chip and a blue light emitting diode chip and a green light emitting diode chip, wherein the molding part comprises a red phosphor. A white light emitting diode is provided.
White light emitting diode, blue light emitting diode chip, green light emitting diode chip, red phosphor
1A and 1B are a perspective view and a cross-sectional view of a white light emitting diode according to the prior art.
2A and 2B are a perspective view and a cross-sectional view of a white light emitting diode according to a first embodiment of the present invention.
3A and 3B are a plan view and a cross-sectional view of a white light emitting diode according to a second embodiment of the present invention.
4 is a cross-sectional view of a white light emitting diode according to a third embodiment of the present invention.
5A and 5B are diagrams illustrating an emission spectrum of a white light emitting diode according to the related art and the present invention.
210; A substrate 220; First lead terminal
230; Second lead terminal 240a; Blue light emitting diode chip
240b; Green light emitting diode chip 250; Reflector
260; Wire 270; Red phosphor
280; Molding part
The present invention relates to a white light emitting diode, and more particularly, to a white light emitting diode having a molding portion in which a red phosphor is mixed on a blue light emitting diode chip and a green light emitting diode chip.
In the past, light emitting diodes, which were mainly used for simple displays and dials, have been developed in compound semiconductor technology. As a result, high luminance red, orange, green, blue, and white light emitting diodes have emerged in various fields requiring full color, high reliability, low power, and small size. Application is possible. In particular, the appearance of a white light emitting diode shows the possibility of use as an illumination light source as its lighting efficiency exceeds incandescent bulbs, and is also used as a backlight light source of LCD.
Various methods for realizing such a white light emitting diode have been developed. In the single chip type, a method of obtaining white by combining phosphors on a blue or ultraviolet light emitting diode chip and two or three light emitting diode chips in a multichip form And the like to obtain white by combining with each other.
In the case of using a blue light emitting diode chip in the prior art, a blue light emitting diode chip is used as an excitation light source, and the excitation light is passed through a yellow emitting phosphor of YAG (Yttrium Aluminum Garnet), thereby implementing a white light emitting diode. However, the method has a disadvantage in that it is easy to cause a glare effect due to color separation due to the wide wavelength interval between blue and yellow, and difficult to adjust color temperature and color rendering index.
In addition, there is a method of implementing a white light emitting diode by applying a red, green and blue phosphor on the ultraviolet light emitting diode chip. However, the ultraviolet light emitting diode chip has a problem of short life and low efficiency.
On the other hand, in order to implement a white light emitting diode as a multi-chip, a combination of red, green, and blue light emitting diode chips, but there are problems such as non-uniformity of the operating voltage for each chip, change of the output of each chip according to the ambient temperature .
1A and 1B are a perspective view and a cross-sectional view of a white light emitting diode according to the prior art. 1A and 1B, an example of implementing a white light emitting diode by using a blue light emitting diode chip as an excitation light source and passing the excitation light through a yellow emitting phosphor of YAG (Yttrium Aluminum Garnet) is shown.
The white light emitting diodes illustrated in FIGS. 1A and 1B are side view light emitting diodes used as a backlight light source of a liquid crystal display. The white light emitting diode includes a substrate 110, a first lead terminal 120, a second lead terminal 130, a blue light emitting diode chip 140, a reflector 150, a wire 160, a phosphor 170, and The molding unit 180 is included.
Looking at the white light emitting diode of the side view method, a first lead terminal 120 and a second lead terminal 130 formed on the substrate 110 are disposed, and the blue light emitting diode chip 140 is disposed on the second terminal. ) Is implemented. A reflector 150 for reflecting light emitted from the blue LED chip 140 laterally is formed on the substrate, and the molding part 180 encapsulates the blue LED chip 140. In the molding part, a phosphor 170, for example, YAG (Yttrium Aluminum Garnet) is mixed. As a result, the blue light emitted from the blue light emitting diode chip excites the phosphor 170 to generate yellow light, and the white light is emitted by the constructive interference between the yellow light and the blue light. Therefore, since only blue light and yellow light exist, there is a limit in expressing red and green, which causes a problem of degrading color reproducibility. In addition, as described above, the white light emitting diodes implemented according to the prior art have a problem, a situation that requires a white light emitting diode to compensate for this.
SUMMARY OF THE INVENTION The present invention has been made to overcome the above-mentioned conventional problems, and an object of the present invention is to provide a white light emitting diode that can improve color reproducibility by emitting all of red light, green light, and blue light.
According to an aspect of the present invention for achieving the object of the present invention, a blue light emitting diode chip; A green light emitting diode chip and a molding part for encapsulating the blue light emitting diode chip and the green light emitting diode chip are provided, and the molding part is provided with a white light emitting diode, characterized in that it comprises a red phosphor.
The red phosphor includes (Sr 1 - x Eu x ) S or (Ca 1 - x Eu x ) S, wherein x is 0.001 to 0.02.
The molding portion is characterized in that it comprises a resin.
The method may further include lead terminals for applying a voltage to the LED chips and a substrate on which the lead terminals are disposed.
It is disposed on the substrate, characterized in that it further comprises a reflector for reflecting light from the light emitting diode chips in a predetermined direction.
Light emitting diodes are being manufactured in various forms.In accordance with the trend toward miniaturization and slimming of information and communication devices, various components such as resistors, capacitors, and noise filters are becoming more miniaturized. It is manufactured in a surface mount device (SMD) type. The SMD type light emitting diode is manufactured in a side view and a top view according to the use. In the following FIGS. 2 and 3, a SMD white light emitting diode having a side view and a top view. It demonstrates.
2A and 2B are a perspective view and a cross-sectional view of a white light emitting diode according to a first embodiment of the present invention. The white light emitting diodes illustrated in FIGS. 2A and 2B are side view type white light emitting diodes used as backlight sources of small and medium sized liquid crystal displays.
The white light emitting diode may include a substrate 210, a first lead terminal 220, a second lead terminal 230, a blue light emitting diode chip 240a, a green light emitting diode chip 240b, a reflector 250, and a wire ( 260a and 260b, a red phosphor 270 and a molding part 280.
The first lead terminal 220 and the second lead terminal 230 are formed on the substrate 210. The blue light emitting diode chip 240a and the green light emitting diode chip 240b are mounted on the first lead terminal 220, and the blue light emitting diode chip 240a and the green light emitting diode chip are connected through the wires 260a and 260b. 240b is connected to the second lead terminal 230. In the present embodiment, the blue light emitting diode chip 240a and the green light emitting diode chip 240b are connected in series, but the present invention is not limited thereto, and the blue light emitting diode chip and the green light emitting diode chip may be connected in parallel. Do.
The reflector 250 is formed on the substrate so that one side thereof is open, so that light emitted from the LED chips can be reflected to the side.
The molding part 280 is coated in the reflecting part 250 to encapsulate the blue LED chip 240a and the green LED chip 240b, and form the first lead terminal 220 and the second lead terminal. It serves to fix the 230. At this time, the molding part is a transparent resin such as epoxy resin or silicone resin.
The red phosphor 270 is included in the molding part 280, and the light emitted from the blue light emitting diode chip 240a or the green light emitting diode chip 240b excites the red phosphor 270 to generate red light. Create Therefore, blue light, green light, and red light are mixed to emit white light.
In this case, as the red phosphor 270, (Sr 1 - x Eu x ) S or (Ca 1 - x Eu x ) S is used, where x is 0.001 to 0.02. In addition, various red phosphors may be used.
The blue light emitting diode chip 240a may be manufactured using a group IV such as silicon carbide (SiC), a group II-IV such as ZnSe and ZnS, a group III-V semiconductor of GaN, and the like. Use the material system. Since GaN can emit light from red to near ultraviolet rays according to the composition ratio of In, it is possible to manufacture not only a blue light emitting diode chip but also a green light emitting diode chip.
3A and 3B are a plan view and a cross-sectional view of a white light emitting diode according to a second embodiment of the present invention. The white light emitting diodes illustrated in FIGS. 3A and 3B are top view white light emitting diodes. Unlike the first embodiment in which light is emitted laterally, the light is emitted upwards, and the remaining components are different. Is similar.
The white light emitting diode includes a substrate 310, first lead terminals 320a and 320b, second lead terminals 330a and 330b, a blue light emitting diode chip 340a, a green light emitting diode chip 340b, and a reflector 350. ), Wires 360a and 360b, a red phosphor 370, and a molding part 380.
Two first lead terminals 320a and 320b and two second lead terminals 330a and 330b are formed on the substrate 310. The blue light emitting diode chip 340a is mounted on the first lead terminal 320a, and the green light emitting diode chip 340b is mounted on the first lead terminal 320b. The blue light emitting diode chip 340a and the green light emitting diode chip 340b are connected to the second lead terminals 330a and 330b through the respective wires 360a and 360b.
The reflector 350 is formed on the substrate 310 to surround the blue and green light emitting diode chips 340a and 340b. In this case, the blue and green light emitting diode chips are used to improve the brightness and the light condensing ability of the light. The inner wall of the reflector 350 surrounding the 340a and 340b may be formed to have a predetermined slope. By forming the reflector 370 as described above, it is possible to maximize the reflection of the light emitted from the blue and green LED chips 340a and 340b.
The molding part 380 is coated in the reflective part 350 to encapsulate the blue light emitting diode chip 340a and the green light emitting diode chip 340b, and the first lead terminals 320a and 320b and the second lead. The lead terminals 330a and 330b are fixed. At this time, the molding part is a transparent resin such as epoxy resin or silicone resin.
The red phosphor 370 is included in the molding part 380, and the light emitted from the blue light emitting diode chip 340a or the green light emitting diode chip 340b excites the red phosphor 370 to emit red light. Create Therefore, blue light, green light, and red light are mixed to emit white light. As described above, the red phosphor 370 is used as (Sr 1 - x Eu x ) S or (Ca 1 - x Eu x ) S, wherein x is 0.001 to 0.02.
4 is a cross-sectional view of a white light emitting diode according to a third embodiment of the present invention. The white light emitting diode according to the third embodiment is a chip-shaped light emitting diode, which is different from the second embodiment in that there is no reflecting unit, and the remaining components are similar. In addition, in the present embodiment, the molding part 380 is shown in a hemispherical shape, but is not limited thereto, and the molding part may be manufactured in various forms.
2A to 4 illustrate various types of white light emitting diodes, but the present invention is not limited thereto and may be applied to other types of white light emitting diodes other than those described above.
5A is a light emission spectrum of the white light emitting diode according to the related art, that is, FIG. 1, and FIG. 5B is a light emission spectrum of the white light emitting diode according to the present invention.
Referring to FIG. 5A, an emission peak exists only near blue and yellow, and an emission peak does not exist near green and red. Therefore, there is a limit in expressing green and red, and color reproducibility has fallen.
Referring to FIG. 5B, unlike the emission spectrum shown in FIG. 5A, it can be seen that emission peaks exist in the green and red portions as well as in the blue. Thus, there was no difficulty in expressing green and red colors, thereby improving color reproducibility.
What has been described above is only an exemplary embodiment of a white light emitting diode according to the present invention, and the present invention is not limited to the above-described embodiment, and as claimed in the following claims, it is beyond the scope of the present invention. Without departing from the scope of the present invention, those skilled in the art will have the technical spirit of the present invention to the extent that various modifications can be made.
As described above, according to the present invention, a blue light emitting diode chip and a green light emitting diode chip are included, and a red phosphor excited by light emitted from the light emitting diode is embodied to implement a white light emitting diode. By emitting white light by the combination, an effect of improving color reproducibility is obtained.
First to fourth lead terminals spaced apart from each other on the substrate;
Blue light emitting diode chips;
Green light emitting diode chip; And
And a molding part for encapsulating the blue light emitting diode chip and the green light emitting diode chip.
The molding part includes a red phosphor having (Sr1-xEux) S or (Ca1-xEux) S (0.001 ≦ x ≦ 0.02),
The blue LED chip is disposed on a first lead terminal and electrically connected to the second lead terminal,
The green light emitting diode chip is disposed on a third lead terminal and electrically connected to the fourth lead terminal.
The blue light emitting diode chip and the green light emitting diode chip are disposed in a diagonal direction with each other, and the second lead terminal and the fourth lead terminal are also arranged in a diagonal direction with each other.
The molding unit comprises a white light emitting diode, characterized in that the resin.
The electrically connected white light emitting diode, characterized in that connected via a wire.
And a reflector disposed on the substrate and reflecting light from the light emitting diode chips in a predetermined direction.
KR1020050116520A 2005-12-01 2005-12-01 White light emitting diode KR101200400B1 (en)
KR1020050116520A KR101200400B1 (en) 2005-12-01 2005-12-01 White light emitting diode
US11/435,400 US7759683B2 (en) 2005-12-01 2006-05-15 White light emitting diode
JP2006204646A JP2007158296A (en) 2005-12-01 2006-07-27 White light emitting diode
KR20070058185A KR20070058185A (en) 2007-06-08
KR101200400B1 true KR101200400B1 (en) 2012-11-16
JP3138795U (en) * 2007-11-02 2008-01-17 サンケン電気株式会社 Semiconductor light emitting device and planar light source using semiconductor light emitting device
KR101586023B1 (en) * 2008-12-03 2016-01-18 서울반도체 주식회사 Light emitting diode and backlight unit having the same
TW201517323A (en) 2013-08-27 2015-05-01 Glo Ab Molded LED package and method of making same
CN107946434A (en) * 2017-11-27 2018-04-20 广东晶科电子股份有限公司 White light emitting diode and backlight module
JP2019114637A (en) 2017-12-22 2019-07-11 日亜化学工業株式会社 Light-emitting device
CN1242022C (en) * 2003-11-28 2006-02-15 上海师范大学 Process for preparing rare-earth red luminescent materials
JP4654670B2 (en) * 2003-12-16 2011-03-23 日亜化学工業株式会社 Light emitting device and manufacturing method thereof
JP4369738B2 (en) * 2003-12-25 2009-11-25 京セラ株式会社 Light emitting element storage package and light emitting device
2005-12-01 KR KR1020050116520A patent/KR101200400B1/en not_active IP Right Cessation
2006-05-15 US US11/435,400 patent/US7759683B2/en not_active Expired - Fee Related
2006-07-27 JP JP2006204646A patent/JP2007158296A/en active Pending
US7759683B2 (en) 2010-07-20
KR20070058185A (en) 2007-06-08
US20070126011A1 (en) 2007-06-07
JP2007158296A (en) 2007-06-21
JPWO2009028657A1 (en) 2010-12-02 Light emitting device
2010-10-26 N231 Notification of change of applicant