CN103855267A - LED light-emitting component based on photonic crystal reflector - Google Patents

LED light-emitting component based on photonic crystal reflector Download PDF

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Publication number
CN103855267A
CN103855267A CN201410081376.XA CN201410081376A CN103855267A CN 103855267 A CN103855267 A CN 103855267A CN 201410081376 A CN201410081376 A CN 201410081376A CN 103855267 A CN103855267 A CN 103855267A
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China
Prior art keywords
crystal reflector
light
photon crystal
reflector
photonic crystal
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Inventor
杨幸明
杨毅彪
邹泽华
温建华
史雪津
乔娜
马瑞霞
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Taiyuan University of Technology
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Taiyuan University of Technology
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/44—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the coatings, e.g. passivation layer or anti-reflective coating
    • H01L33/46—Reflective coating, e.g. dielectric Bragg reflector

Abstract

The invention belongs to the field of photonic crystal reflection, and particularly relates to an LED light-emitting component based on a photonic crystal reflector. The LED light-emitting component based on the photonic crystal reflector comprises a one-dimensional photonic crystal reflector and an LED structure, wherein the one-dimensional photonic crystal reflector is connected with a substrate of the LED structure, the one-dimensional photonic crystal reflector is any of a green light one-dimensional photonic crystal reflector, a blue light one-dimensional photonic crystal reflector and a purple light one-dimensional photonic crystal reflector, the green light one-dimensional photonic crystal reflector can efficiently reflect green light in the full angle, the blue light one-dimensional photonic crystal reflector can efficiently reflect blue light in the full angle, and the purple light one-dimensional photonic crystal reflector can efficiently reflect purple light with full angle. With the component, light emitted by an LED structure can be utilized to a larger extent.

Description

A kind of LED light-emitting component based on photonic crystal reflector
Technical field
The invention belongs to photonic crystal reflection field, particularly relate to a kind of LED light-emitting component based on photonic crystal reflector.
Background technology
Light-emitting diode (LED) is a kind of low-cost long-life solid state light emitter that is widely used in optoelectronic areas, both can be used as the incoherent light source of lighting apparatus and short distance optical fiber communication, also can be used as the potential light source of the applications such as demonstration, detection, medical science, chemistry and biology.At present, the internal quantum efficiency of GaN base LED has reached 90 %,, but its external quantum efficiency generally lower be only 5%.Some disengaging chip of the light that LED structure is sent is utilized; Another part light directive substrate, thus make to exist a large amount of luminous energy to be utilized, and this is a reason that causes LED external quantum efficiency low.In order to address this problem, researcher often uses metallic film to be plated in substrate bottom as the reflector raising efficiency of light energy utilization, but because metallic film reflector self exists very large defect, absorption to luminous energy is larger, and metallic film reflector reflectivity is not very high, so be not very good for addressing this problem.
Summary of the invention
Technical problem to be solved by this invention is: the light that how to make LED structure send is utilized to a greater extent.
The technical solution adopted in the present invention is: a kind of LED light-emitting component based on photonic crystal reflector, comprise 1-D photon crystal reflector and LED structure, described 1-D photon crystal reflector is connected with the substrate of LED structure, described 1-D photon crystal reflector is green glow 1-D photon crystal reflector, blue light 1-D photon crystal reflector, any one in purple light 1-D photon crystal reflector, green glow 1-D photon crystal reflector is omnidirectional reflection green glow efficiently, blue light 1-D photon crystal reflector is omnidirectional reflection blue light efficiently, purple light 1-D photon crystal reflector is omnidirectional reflection purple light efficiently.
As a kind of optimal way: prepared by described 1-D photon crystal reflector direct growth in LED structure.
As a kind of optimal way: described 1-D photon crystal reflector, its structure is
Figure 201410081376X100002DEST_PATH_IMAGE002
, the periodicity that wherein m is photonic crystal, A is lithium fluoride, dielectric constant
Figure 201410081376X100002DEST_PATH_IMAGE004
=1.96; B is germanium, dielectric constant
Figure 201410081376X100002DEST_PATH_IMAGE006
=16, green glow 1-D photon crystal reflector lattice constant is
Figure 201410081376X100002DEST_PATH_IMAGE008
=145nm, lithium fluoride layer thickness
Figure 201410081376X100002DEST_PATH_IMAGE010
=0.7
Figure 924008DEST_PATH_IMAGE008
, germanium layer thickness
Figure 201410081376X100002DEST_PATH_IMAGE012
=0.3 , blue light 1-D photon crystal reflector lattice constant is
Figure 201410081376X100002DEST_PATH_IMAGE014
=145nm, lithium fluoride layer thickness
Figure 201410081376X100002DEST_PATH_IMAGE016
=0.9
Figure 997716DEST_PATH_IMAGE014
, germanium layer thickness
Figure 201410081376X100002DEST_PATH_IMAGE018
=0.1
Figure 392926DEST_PATH_IMAGE014
, purple light 1-D photon crystal reflector lattice constant is
Figure 201410081376X100002DEST_PATH_IMAGE020
=135nm, lithium fluoride layer thickness
Figure 201410081376X100002DEST_PATH_IMAGE022
=0.9
Figure 82664DEST_PATH_IMAGE020
, germanium layer thickness
Figure 201410081376X100002DEST_PATH_IMAGE024
=0.1 .
The invention has the beneficial effects as follows: in each spectral region, can realize good reflectivity, green glow reflector forbidden band covers the scope of wavelength 478nm～680nm, blu-ray reflection device forbidden band covers the scope of optical wavelength 402nm～465nm, purple light reflector forbidden band covers the scope of optical wavelength 374nm～433nm, and when angle of reflection is in the time changing for 0 ° to 90 °, reflectivity can reach more than 99%.Can effectively solve LED light path scattering problem, by the light energy conversions that dissipate more for can utilize luminous energy, thereby improve the external quantum efficiency of LED.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is green glow 1-D photon crystal reflector structure schematic diagram of the present invention;
Fig. 3 is green glow 1-D photon crystal reflector bandgap figure of the present invention;
Fig. 4 is that the present invention works as light normal incidence, when incident angle is 0 °, and the reflectance spectrum of green glow 1-D photon crystal reflector;
Fig. 5 is the change curve of green glow 1-D photon crystal reflector of the present invention forbidden band with angle of incidence of light degree;
Fig. 6 is blue light 1-D photon crystal reflector structure schematic diagram of the present invention;
Fig. 7 is blue light 1-D photon crystal reflector bandgap figure of the present invention;
Fig. 8 is that the present invention works as light normal incidence, when incident angle is 0 °, and the reflectance spectrum of blue light 1-D photon crystal reflector;
Fig. 9 is the change curve of blue light 1-D photon crystal reflector of the present invention forbidden band with angle of incidence of light degree;
Figure 10 is purple light 1-D photon crystal reflector structure schematic diagram of the present invention;
Figure 11 is purple light 1-D photon crystal reflector bandgap figure of the present invention;
Figure 12 is that the present invention works as light normal incidence, when incident angle is 0 °, and the reflectance spectrum of purple light 1-D photon crystal reflector;
Figure 13 is the change curve of purple light 1-D photon crystal reflector of the present invention forbidden band with angle of incidence of light degree;
Figure 14 is the index path while not using the LED light-emitting component of reflector normally to work;
Figure 15 is the index path while using the LED light-emitting component of solid metal reflector normally to work;
Index path when Figure 16 LED light-emitting component of the present invention is normally worked.
Embodiment
The present invention includes 1-D photon crystal reflector and LED structure, as shown in Figure 1,1-D photon crystal reflector is connected with the substrate of LED structure, and 1-D photon crystal reflector structure is , the periodicity that wherein m is photonic crystal, A is lithium fluoride, dielectric constant
Figure 433377DEST_PATH_IMAGE004
=1.96; B is germanium, dielectric constant
Figure 413840DEST_PATH_IMAGE006
=16, as shown in Figure 2, green glow 1-D photon crystal reflector lattice constant is
Figure 407204DEST_PATH_IMAGE008
=145nm, lithium fluoride layer thickness
Figure 223850DEST_PATH_IMAGE010
=0.7 , germanium layer thickness =0.3
Figure 727141DEST_PATH_IMAGE008
, the periodic arrangement direction that z direction is photonic crystal.As shown in Figure 6, blue light 1-D photon crystal reflector lattice constant is
Figure 968766DEST_PATH_IMAGE014
=145nm, lithium fluoride layer thickness
Figure 306207DEST_PATH_IMAGE016
=0.9
Figure 949678DEST_PATH_IMAGE014
, germanium layer thickness =0.1
Figure 322420DEST_PATH_IMAGE014
, the periodic arrangement direction that z direction is photonic crystal, as shown in figure 10, purple light 1-D photon crystal reflector lattice constant is =135nm, lithium fluoride layer thickness
Figure 961529DEST_PATH_IMAGE022
=0.9
Figure 733176DEST_PATH_IMAGE020
, germanium layer thickness =0.1
Figure 379369DEST_PATH_IMAGE020
, the periodic arrangement direction that z direction is photonic crystal.
1-D photon crystal reflector of the present invention selects LED chip Sapphire Substrate as optical base-substrate, to adopt model be WD.54-450 vacuum coating equipment 16 layers of alternating deposits successively on optical base-substrate, take green glow reflector as example: 1st, 3,5,7,9,11,13,15 layer thicknesses as
Figure 731853DEST_PATH_IMAGE010
=0.7
Figure 736718DEST_PATH_IMAGE008
lithium fluoride layer, the 2nd, 4,6,8,10,12,14,16 layers is that thickness is
Figure 174653DEST_PATH_IMAGE012
=0.3
Figure 906854DEST_PATH_IMAGE008
germanium layer.Like this on corresponding LED substrate according to table 1 grow successively from bottom to up germanium, lithium fluoride totally 16 layer films of desired thickness, thereby in green light LED structure, prepare the omnidirectional reflection device that covers optical wavelength 478nm～680nm scope.
Each layer of dielectric material of table 1 1-D photon crystal reflector and coating film thickness
Figure DEST_PATH_IMAGE026
Fig. 3 is green glow 1-D photon crystal reflector bandgap figure of the present invention, and its forbidden band normalized frequency scope is 0.156～0.304, and its forbidden band scope is that 477nm～929nm(green wavelength is about 492nm～577nm); Fig. 7 is blue light 1-D photon crystal reflector bandgap figure of the present invention, and its forbidden band normalized frequency scope is 0.225～0.362, and its forbidden band scope is that 400nm～644nm(blue light wavelength scope is about 435nm～450nm); Figure 11 is purple light 1-D photon crystal reflector bandgap figure of the present invention, and its forbidden band normalized frequency scope is 0.225～0.362, and its forbidden band scope is that 473nm～600nm(violet wavelength scope is about 390nm～435nm).
Fig. 4 is that the present invention works as light normal incidence, when incident angle is 0 °, and the reflectance spectrum of green glow 1-D photon crystal reflector, it is 478nm～915nm that reflectivity is greater than 99% forbidden band scope.Fig. 8 is that the present invention works as light normal incidence, when incident angle is 0 °, and the reflectance spectrum of blue light 1-D photon crystal reflector, it is 402nm～631nm that reflectivity is greater than 99% forbidden band scope.Figure 12 is that the present invention works as light normal incidence, when incident angle is 0 °, and the reflectance spectrum of purple light 1-D photon crystal reflector, it is 374nm～587nm that reflectivity is greater than 99% forbidden band scope.
Fig. 5 is the change curve of green glow 1-D photon crystal reflector of the present invention forbidden band with angle of incidence of light degree, in figure: abscissa is angle of incidence of light degree, ordinate is optical wavelength, Curves is shown the variation tendency of forbidden band with angle of incidence of light degree, can in the scope that covers optical wavelength 478nm～680nm, realize omnidirectional reflection.Fig. 9 is the change curve of blue light 1-D photon crystal reflector of the present invention forbidden band with angle of incidence of light degree; In figure: abscissa is angle of incidence of light degree, ordinate is optical wavelength, and Curves is shown the variation tendency of forbidden band with angle of incidence of light degree, can in the scope that covers optical wavelength 402nm～465nm, realize omnidirectional reflection.Figure 13 is the change curve of purple light 1-D photon crystal reflector of the present invention forbidden band with angle of incidence of light degree; In figure: abscissa is angle of incidence of light degree, ordinate is optical wavelength, and Curves is shown the variation tendency of forbidden band with angle of incidence of light degree, can in the scope that covers optical wavelength 374nm～433nm, realize omnidirectional reflection.
Figure 14 is the index path while not using the LED light-emitting component of reflector normally to work; Figure 15 is the index path while using the LED light-emitting component of solid metal reflector normally to work; Index path when Figure 16 LED light-emitting component of the present invention is normally worked.
From above figure, can find out the present invention light with the ranges of incidence angles of 0 ° to 90 ° in, all can realize the high reflectance in designated frequency range.Can meet the function of designated band omnidirectional reflection device.And 1-D photon crystal is simple compared with two and three dimensions photon crystal structure, be easier to preparation, is beneficial to large-scale application for the preparation of LED light-emitting component.

Claims (3)

1. the LED light-emitting component based on photonic crystal reflector, it is characterized in that: comprise 1-D photon crystal reflector and LED structure, described 1-D photon crystal reflector is connected with the substrate of LED structure, described 1-D photon crystal reflector is green glow 1-D photon crystal reflector, blue light 1-D photon crystal reflector, any one in purple light 1-D photon crystal reflector, green glow 1-D photon crystal reflector is omnidirectional reflection green glow efficiently, blue light 1-D photon crystal reflector is omnidirectional reflection blue light efficiently, purple light 1-D photon crystal reflector is omnidirectional reflection purple light efficiently.
2. a kind of LED light-emitting component based on photonic crystal reflector according to claim 1, is characterized in that: prepared by described 1-D photon crystal reflector direct growth in LED structure.
3. according to claim 1 or a kind of LED light-emitting component based on photonic crystal reflector claimed in claim 2, it is characterized in that: described 1-D photon crystal reflector, its structure is
Figure 201410081376X100001DEST_PATH_IMAGE002
, the periodicity that wherein m is photonic crystal, A is lithium fluoride, dielectric constant =1.96; B is germanium, dielectric constant
Figure DEST_PATH_IMAGE006
=16, green glow 1-D photon crystal reflector lattice constant is
Figure DEST_PATH_IMAGE008
=145nm, lithium fluoride layer thickness
Figure DEST_PATH_IMAGE010
=0.7
Figure 809051DEST_PATH_IMAGE008
, germanium layer thickness =0.3
Figure 234084DEST_PATH_IMAGE008
, blue light 1-D photon crystal reflector lattice constant is
Figure DEST_PATH_IMAGE014
=145nm, lithium fluoride layer thickness
Figure DEST_PATH_IMAGE016
=0.9
Figure 221632DEST_PATH_IMAGE014
, germanium layer thickness
Figure DEST_PATH_IMAGE018
=0.1
Figure 258989DEST_PATH_IMAGE014
, purple light green glow 1-D photon crystal reflector lattice constant is
Figure DEST_PATH_IMAGE020
=135nm, lithium fluoride layer thickness =0.9
Figure 382803DEST_PATH_IMAGE020
, germanium layer thickness =0.1
Figure 981668DEST_PATH_IMAGE020
.
CN201410081376.XA 2014-03-07 2014-03-07 LED light-emitting component based on photonic crystal reflector Pending CN103855267A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11538864B2 (en) * 2018-06-15 2022-12-27 Fuzhou Boe Optoelectronics Technology Co., Ltd. Double-sided display panel and manufacture method thereof, and double-sided display device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101308890A (en) * 2007-05-17 2008-11-19 晶元光电股份有限公司 Light emitting diode element and manufacture method thereof
CN101789475A (en) * 2010-01-21 2010-07-28 太原理工大学 Photonic crystal light-emitting diode and manufacturing method thereof
CN102681056A (en) * 2012-06-06 2012-09-19 太原理工大学 Near-ultraviolet to near-infrared band full-angle reflector based on photonic crystals
JP5315513B2 (en) * 2011-07-12 2013-10-16 丸文株式会社 Light emitting device and manufacturing method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101308890A (en) * 2007-05-17 2008-11-19 晶元光电股份有限公司 Light emitting diode element and manufacture method thereof
CN101789475A (en) * 2010-01-21 2010-07-28 太原理工大学 Photonic crystal light-emitting diode and manufacturing method thereof
JP5315513B2 (en) * 2011-07-12 2013-10-16 丸文株式会社 Light emitting device and manufacturing method thereof
CN102681056A (en) * 2012-06-06 2012-09-19 太原理工大学 Near-ultraviolet to near-infrared band full-angle reflector based on photonic crystals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11538864B2 (en) * 2018-06-15 2022-12-27 Fuzhou Boe Optoelectronics Technology Co., Ltd. Double-sided display panel and manufacture method thereof, and double-sided display device

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