CN115224176A - Far-red light LED device and application thereof - Google Patents
Far-red light LED device and application thereof Download PDFInfo
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- CN115224176A CN115224176A CN202210648254.9A CN202210648254A CN115224176A CN 115224176 A CN115224176 A CN 115224176A CN 202210648254 A CN202210648254 A CN 202210648254A CN 115224176 A CN115224176 A CN 115224176A
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers 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 semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/0613—Apparatus adapted for a specific treatment
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N2005/0658—Radiation therapy using light characterised by the wavelength of light used
- A61N2005/0659—Radiation therapy using light characterised by the wavelength of light used infrared
- A61N2005/066—Radiation therapy using light characterised by the wavelength of light used infrared far infrared
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- H—ELECTRICITY
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Abstract
The invention belongs to the field of LED device preparation, and discloses a far-red LED device and application thereof. The LED device is prepared by mixing far-infrared fluorescent powder, transparent silica gel and optional red fluorescent powder and packaging by a packaging process; the chemical formula of the far-red fluorescent powder is as follows: RE 3 (Ga 1‑x Cr x ) 5 O 12 Wherein RE is at least one of Gd, Y and Lu, 0.001<x<0.12. The far-red light LED device is formed by packaging the far-red light fluorescent powder and a blue light chip with the emission wavelength of 440-480nm, and meets the requirements of myopia prevention and control and non-dumping light biological treatment of teenagers on a novel light source.
Description
Technical Field
The invention belongs to the field of LED device preparation, and particularly relates to a far-red LED device and application thereof.
Background
Juvenile myopia is a global social problem and also a significant public health problem affecting national quality, especially juvenile eye health. Due to the global wide popularity, the development of novel prevention and control technologies and medical equipment is urgently needed to deal with the demand.
Myopia is caused by multiple factors, and the pathogenesis of myopia is unknown up to now. Recent opinion suggests that myopia is associated with ocular fundus and sclera hypoxia, while the mainstream opinion suggests that axial myopia elongation of the ocular axis is regulated by the neurotransmitter dopamine.
At present, the latest technologies adopted for preventing and controlling myopia mainly comprise titration of low-concentration atropine, wearing of progressive multifocal lens frame glasses, wearing of cornea shaping using glasses (OK glasses for short), and using of a light supplying instrument for 650nm laser irradiation. Each technique has its effectiveness, but it is also a thousand years old. The eye is a photodetector that distinguishes between visible light intensity and chromaticity. Therefore, it is considered that, aiming at the social problem that teenagers are short-sighted and spread to a large number of people in the world, the problem needs to be solved by adopting photon means and photon technology. Outdoor exercises are the most effective and safest way for preventing and controlling myopia that is accepted by all ophthalmologists. However, whether outdoor sports are sunlight, air, moisture or some mechanism plays a role, and therefore, there has been no theory on the mechanism of outdoor sports for preventing and controlling myopia.
Therefore, it is highly desirable to provide an LED light emitting device for the prevention, control and treatment of myopia in teenagers.
Disclosure of Invention
The invention aims to provide a far-red LED device and application thereof, aiming at the defects of the prior art. The far-red light LED device is formed by packaging the far-red light fluorescent powder and a blue light chip with the emission wavelength of 440-480nm, and meets the requirements of myopia prevention and control and non-dumping light biological treatment of teenagers on a novel light source.
In order to achieve the purpose, the inventor collects spectrums in various regions of the world for years continuously, and the spectrums are distributed on land, under tree shades, on water surfaces of deserts, grasslands, rivers, lakes and seas, and compared with indoor spectrums outdoors, the inventor deduces that the sunlight which can play the role of effectively preventing and controlling myopia is not air, not water vapor, but sunlight, and the sunlight plays the role of not ultraviolet rays in the solar spectrum, not long-wave infrared rays, but mainly 600-1000nm red light-near infrared light (for simplification, photons in the range of 600-1000nm are collectively called far-red light, namely the far-red light refers to light in the range of 600-1000 nm), and particularly the far-red light of 650-950nm corresponding to a first treatment window of an organism. Based on this, the inventor also takes two solar spectrums collected under sunlight and tree shadow respectively in 2021 year 12, 8 month 5 day 12. By comparing the spectra collected at different time and space around the world, the band of 650-950nm is considered to play an effective role in preventing and controlling juvenile myopia.
Therefore, the invention provides a far-red light LED device, which is prepared by mixing far-red light phosphor powder, transparent silica gel and optional red light phosphor powder, and packaging by a packaging process;
the chemical formula of the far-red fluorescent powder is as follows: RE 3 (Ga 1-x Cr x ) 5 O 12 Wherein RE is at least one of Gd, Y and Lu, 0.001<x<0.12。
According to the present invention, preferably, the chemical formula RE of the far-red phosphor 3 (Ga 1-x Cr x ) 5 O 12 The value of x in (b) is: 0.03<x<0.06。
According to the present invention, preferably, the method for preparing the far-red phosphor comprises:
the first step is as follows: will contain Cr 3+ The raw material (2), the raw material containing the element Ga, the raw material containing the element RE, and the flux are ground and mixed uniformlyCalcining for the first time to obtain a first-step product;
the second step is that: and grinding the product obtained in the first step, then carrying out secondary calcination, crushing, grinding, washing, filtering and drying to obtain the far-red fluorescent powder.
According to the present invention, preferably, the raw material containing the element RE is at least one of an oxide, a nitrate, an oxalate, and a carbonate containing the element RE.
According to the invention, preferably, said element containing Cr 3+ Is prepared from Cr 3+ At least one of an oxide, a nitrate, an oxalate and a carbonate.
According to the present invention, it is preferable that the raw material containing the element Ga is at least one of an oxide, a nitrate, an oxalate, and a carbonate containing the element Ga.
According to the present invention, preferably, the operating conditions of the first calcination include: heating to 100-300 deg.C at 3-10 deg.C/min in air, maintaining for 0.3-1 hr, heating to 400-600 deg.C at 3-10 deg.C/min, maintaining for 1-3 hr, cutting off power, and cooling to 25-30 deg.C.
According to the present invention, preferably, the operating conditions of the second calcination include: heating to 850-950 deg.C at 3-10 deg.C/min in air, maintaining for 0.5-2 hr, heating to 1300-1450 deg.C at 3-8 deg.C/min, maintaining for 4-10 hr, cooling to 300-800 deg.C at 3-10 deg.C/min, cutting off power, and furnace cooling to 25-30 deg.C.
According to the present invention, it is preferable that the amount of the flux added is 0.05 to 2.0wt% of the total mass of the raw materials used for preparing the far-red phosphor.
According to the present invention, preferably, the flux is at least one of aluminum fluoride, barium fluoride, ammonium chloride and boric acid. Preferably, the fluxing agent is boric acid.
According to the present invention, preferably, the far-red phosphor has an emission wavelength range of 600 to 1000nm and an emission wavelength peak of 650 to 900nm.
According to the invention, the ratio of the dosage of the far-red fluorescent powder to the dosage of the transparent silica gel is preferably 1 (0-0.05) to (0.2-0.8).
According to the present invention, the red phosphor has a chemical formula of (Ca, sr) AlSiN 3 :Eu 2+ Or is M 2 Si 5 N 8 :Eu 2+ Wherein M is at least one of Sr, ca, ba and Mg.
According to the present invention, preferably, the packaging process includes: and (3) defoaming and degassing a mixture of the far-red light fluorescent powder, the transparent silica gel and the optional red light fluorescent powder, titrating the mixture on a blue light LED chip, and baking and curing to obtain the far-red light LED device.
According to the present invention, preferably, the emission wavelength peak of the blue LED chip is 440 to 480nm.
According to the present invention, preferably, the far-red LED device has an emission wavelength range of 600 to 1000nm and an emission wavelength peak of 650 to 900nm.
The invention provides the application of the far-red LED device as a light source for preventing, controlling and treating juvenile myopia.
The technical scheme of the invention has the following beneficial effects:
(1) The invention adopts fluorescent powder and a blue light LED chip with the emission wavelength of 440-480nm to package to form an LED device, and the LED device is used as a core light-emitting element to manufacture a light source. The laser light source emits coherent light, and compared with laser, the non-coherent light provided by the invention has high biological safety. The absorption spectrum produced by human cells is often broad. Compared with laser and light sources made of multi-chip LEDs, the light source provided by the invention utilizes the fluorescent powder as the light conversion material to provide broad-band spectrum emission, and can better meet the light absorption requirement of biological tissues.
(2) The far-red fluorescent powder RE of the invention 3 (Ga 1-x Cr x ) 5 O 12 Is a typical of 3 B 2 C 3 O 12 The garnet structure, in which the rare earth elements Gd, Y or Lu occupy the site of A, and the Ga element is doped in the sites of B and C, cr partially replaces Ga as the luminescent center. According to the lattice thermal vibration model, the group of far-red fluorescent powder is formedThe more complex the division, the more phonon vibration modes, and theoretically the lower the luminous efficiency thereof. Cr (chromium) component 3+ As a luminescence center, a key technical problem faced by calcination synthesis in air is Cr 3+ Conversion to Cr 4+ Quenching the luminescence. The invention preferably adopts boric acid as fluxing agent, and boric acid as electron center can prevent Cr 4+ And (4) generating.
(3) The cells in the human eye that secrete dopamine neurotransmitters are primarily retinal pigment epithelial cells. According to the dopamine theory of the myopia occurrence mechanism, to realize dopamine secretion, the retina which is a dopamine-secreting carrier needs to be protected firstly. One of the mechanisms of photobiomodulatory therapy for acute disease is that light activates cytochrome C oxidase to produce Adenosine Triphosphate (ATP) to provide energy to cells and to reduce oxidative stress damage. The light emitted by the far-red light LED device can effectively cover the absorption spectrum of cytochrome C oxidase; the invention also proves that the light emitted by the far-red LED device can effectively reduce the retina damage caused by visible light through the retina slices of mice raised in different light environments, thereby playing a role in protecting the retina.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Figure 1 shows the solar spectrum collected under sunlight by the present invention.
FIG. 2 shows solar spectra collected in the shade of trees according to the present invention.
Fig. 3 shows emission spectra of a far-red LED device provided in embodiment 1 of the present invention at different driving currents.
Fig. 4 shows radiant optical power and photoelectric conversion efficiency of a far-red LED device provided in embodiment 1 of the present invention under different driving currents.
FIG. 5 is a graph showing the comparison of the emission spectrum and the absorption spectrum of cytochrome C oxidase of a far-red LED device provided in example 1 of the present invention.
FIG. 6 is a schematic diagram showing the emission spectra of the far-red phosphors provided in examples 2 to 3 of the present invention and comparative examples 1 to 3 under excitation of blue light at 471 nm.
FIG. 7 is a schematic diagram showing excitation spectra of the far-red phosphors provided in examples 2 to 3 of the present invention and comparative examples 1 to 3, which were measured by monitoring 742nm emission.
FIG. 8 is a graph showing the comparison of the far-red phosphors provided in examples 1-3 of the present invention with the solar spectrum of FIG. 1.
FIG. 9 is a graph showing the comparison of far-red phosphors provided in examples 1-3 of the present invention with the solar spectrum collected in the shade of FIG. 2.
FIG. 10 shows the integrated luminous intensity of the far-red phosphors provided in examples 1 to 3 of the present invention as a function of temperature.
FIG. 11 is a schematic diagram showing an emission spectrum of the far-red phosphor according to the present invention under excitation of blue light at 471nm provided in comparative example 4.
FIG. 12 is a schematic diagram showing an excitation spectrum of the far-red phosphor provided in comparative example 4 of the present invention measured by monitoring emission at 742 nm.
FIG. 13 is a schematic diagram showing the emission spectra of the far-red phosphors provided in examples 4 to 7 of the present invention under excitation of 471nm blue light.
FIG. 14 is a schematic diagram showing excitation spectra of far-red phosphors provided in examples 4 to 7 of the present invention measured by monitoring 742nm emission.
FIG. 15 is a schematic diagram showing the emission spectra of the far-red phosphors provided in examples 8 to 11 of the present invention under excitation of 471nm blue light.
FIG. 16 is a diagram showing excitation spectra of far-red phosphors provided in examples 8 to 11 of the present invention measured by monitoring 742nm emission.
FIG. 17 is a diagram showing the emission spectra of the far-red phosphors provided in examples 12 to 14 of the present invention under excitation by 471nm blue light.
FIG. 18 is a diagram showing the excitation spectra of the far-red phosphors provided in examples 12 to 14 of the present invention by monitoring the emission at 742 nm.
FIG. 19 is a diagram showing the emission spectra of the far-red phosphors provided in examples 15 to 18 of the present invention under excitation by 471nm blue light.
FIG. 20 is a diagram showing the excitation spectra of the far-red phosphors provided in examples 15 to 18 of the present invention by monitoring the emission at 742 nm.
FIG. 21 is a diagram showing the emission spectra of far-red phosphors provided in examples 19 to 21 of the present invention under excitation of 471nm blue light.
FIG. 22 is a diagram showing excitation spectra of the far-red phosphors provided in examples 19 to 21 of the present invention measured by monitoring 742nm emission.
Fig. 23 shows retinal sections of white mice cultured under the light-shielding conditions in test example 2 (where INL is the inner retinal layer and ONL is the outer retinal layer).
Fig. 24 shows retinal sections of white mice cultured under blue LED illumination in test example 2 (where INL is the inner retinal layer and ONL is the outer retinal layer).
FIG. 25 shows blue LED + Gd prepared using example 1 in test example 2 3 (Ga 0.96 Cr 0.04 ) 5 O 12 Retina slices of mice were cultured under the irradiation of a phosphor-encapsulated far-red LED (wherein INL is the inner layer of the retina and ONL is the outer layer of the retina).
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In the following examples, the raw materials used to prepare the far-red phosphor include:
Gd 2 O 3 (99.99％)、Dy 2 O 3 (99.99％)、Er 2 O 3 (99.99％)、Lu 2 O 3 (99.99％)、Sm 2 O 3 (99.99％)、Y 2 O 3 (99.99％)、H 3 BO 3 (99.5%) and Cr 2 O 3 (99.0％)。
Example 1
The embodiment provides a far-red LED device, which is prepared by mixing Gd 3 (Ga 0.96 Cr 0.04 ) 5 O 12 The mixture mixed with the transparent silica gel is defoamed, degassed, titrated on a blue light LED chip with the emission wavelength peak value of 450nm, and baked and cured to obtain the transparent silica gel;
the Gd 3 (Ga 0.96 Cr 0.04 ) 5 O 12 The ratio of the dosage of the transparent silica gel to the dosage of the transparent silica gel is 1:0.4.
the Gd 3 (Ga 0.96 Cr 0.04 ) 5 O 12 The preparation method comprises the following steps:
the first step is as follows: will contain Cr 3+ The raw materials of (1), ga containing raw materials, gd containing raw materials and boric acid are ground and mixed uniformly, and are calcined for the first time to obtain a first-step product;
the second step is that: and grinding the product obtained in the first step, then carrying out secondary calcination, crushing, grinding, washing, filtering and drying to obtain the far-red fluorescent powder.
The operating conditions of the first calcination include: heating to 200 deg.C at 5 deg.C/min in air, maintaining for 0.5 hr, heating to 500 deg.C at 5 deg.C/min, maintaining for 2 hr, cutting off power, and cooling to 25 deg.C;
the operating conditions of the second calcination include: heating to 900 ℃ at a speed of 5 ℃/min in the air, preserving heat for 2 hours, heating to 1400 ℃ at a speed of 5 ℃/min, preserving heat for 8 hours, cooling to 600 ℃ at a speed of 5 ℃/min, powering off, and cooling to 25 ℃ along with the furnace;
the addition amount of the boric acid is 1.0wt% of the total mass of the raw materials for preparing the far-infrared fluorescent powder.
The emission spectrum of the LED device of this embodiment and the relevant parameters of the device are shown in fig. 3, 4, and from fig. 3 it can be seen that the device emission wavelength covers the main range of 650-950nm and the LED device emission wavelength peak is red-shifted with current from 732nm (20 mA) to 756nm (280 mA). Fig. 4 shows the relationship between the photoelectric conversion efficiency and the driving current of the device. Under the drive of 20mA, the photoelectric conversion efficiency reaches 33.51%; under the drive of 100mA, the radiation light power is 75.91mW, and the photoelectric conversion efficiency is 25.91%; under the current drive of 280mA, the radiant luminous power reaches 177.2mW.
Comparing the emission spectrum of the LED device shown in FIG. 3 with the absorption spectrum of cytochrome C oxidase, as shown in FIG. 5, it can be found that the emission spectrum of the LED device of the present invention can effectively cover Cu in cytochrome C oxidase Bred And Cu Aoxid The absorption peak of (1).
Examples 2 to 3
Examples 2-3 provide a far-red phosphor, and examples 2-3 differ from example 1 only in that: the far-red fluorescent powder is Y 3 (Ga 0.96 Cr 0.04 ) 5 O 12 And Lu 3 (Ga 0.96 Cr 0.04 ) 5 O 12 。
FIG. 6 and FIG. 7 show the phosphors Gd 3 (Ga 0.96 Cr 0.04 ) 5 O 12 、Y 3 (Ga 0.96 Cr 0.04 ) 5 O 12 、Lu 3 (Ga 0.96 Cr 0.04 ) 5 O 12 The emission spectrum under 471nm blue excitation and the excitation spectrum collected by monitoring the strongest emission peak thereof, from which it can be found that Gd is the strongest 3 (Ga 0.96 Cr 0.04 ) 5 O 12 。Y 3 (Ga 0.96 Cr 0.04 ) 5 O 12 And Lu 3 (Ga 0.96 Cr 0.04 ) 5 O 12 The emission wavelength peak of (A) is adjustable in the range of 712-756nm according to the composition change.
Examples 4 to 7
Examples 4-7 provide far-red phosphors having the formula: gd (Gd) 3 (Ga 1-x Cr x ) 5 O 12 Wherein x is 0.03 (3%), 0.04 (4%), 0.05 (5%)、0.06(6％)。
The preparation method of the far-red phosphors of examples 4 to 7 is the same as that of example 1.
The emission spectrum and excitation spectrum of the far-red phosphors of examples 4 to 7 are shown in FIGS. 13 and 14. As can be seen from FIGS. 13 and 14, the far-red phosphor which gives the best emission was Gd in example 1 3 (Ga 0.96 Cr 0.04 ) 5 O 12 ，x＝0.04。
Examples 8 to 11
Examples 8 to 11 provide far-red fluorescent powders Gd 3 (Ga 0.96 Cr 0.04 ) 5 O 12 Examples 8-11 differ from example 1 only in that: the second heating temperature in the second calcination operation is different and is respectively 1300 ℃, 1350 ℃, 1400 ℃ and 1450 ℃, and the temperature is kept for 6 hours;
the emission spectrum and excitation spectrum of the far-red phosphors of examples 8 to 11 are shown in FIGS. 15 and 16. As can be seen from fig. 15 and 16, the optimum temperature for the second temperature increase in the second firing operation is 1400 ℃.
Examples 12 to 14
Examples 12 to 14 provide far-red fluorescent powders Gd 3 (Ga 0.96 Cr 0.04 ) 5 O 12 Examples 12-14 differ from example 1 only in that: the second heating and heat preservation time in the second calcination operation is different and is respectively 4h, 6h and 10h;
the emission spectra and excitation spectra of the far-red phosphors of examples 12 to 14 are shown in FIGS. 17 and 18. As is clear from fig. 17 and 18, the optimum holding time for the second temperature rise in the second firing operation was 8 hours in example 1.
Examples 15 to 18
Examples 15 to 18 provide far-red fluorescent powders Gd 3 (Ga 0.96 Cr 0.04 ) 5 O 12 Examples 15-18 differ from example 1 only in that: the fluxing agent is aluminum fluoride, barium fluoride, ammonium chloride and boric acid, and the addition amounts of the aluminum fluoride, the barium fluoride, the ammonium chloride and the boric acid are respectively 1% of the total mass of the raw materials used for preparing the far-red fluorescent powder.
The emission spectra and excitation spectra of the far-red phosphors of examples 15 to 18 are shown in FIGS. 19 and 20. As can be seen from fig. 19 and 20, boric acid is the most suitable flux.
Examples 19 to 21
Examples 19 to 21 provide far-red fluorescent powders Gd 3 (Ga 0.96 Cr 0.04 ) 5 O 12 Examples 19-21 differ from example 1 only in that: the boric acid accounts for 0.5wt%, 1.5wt% and 2.0wt% of the total mass of the raw materials used for preparing the far-infrared fluorescent powder respectively.
The emission spectra and excitation spectra of the far-red phosphors of examples 19 to 21 are shown in FIGS. 21 and 22. As is clear from FIGS. 21 and 22, the optimum amount of boric acid added was 1.0wt% of example 1.
Comparative examples 1 to 3
Comparative examples 1-3 provide a phosphor, and comparative examples 1-3 differ from example 1 only in that: the far-red fluorescent powder is Dy 3 (Ga 0.96 Cr 0.04 ) 5 O 12 、Er 3 (Ga 0.96 Cr 0.04 ) 5 O 12 、Sm 3 (Ga 0.96 Cr 0.04 ) 5 O 12 。
FIG. 6 and FIG. 7 show the fluorescent powder Dy 3 (Ga 0.96 Cr 0.04 ) 5 O 12 、Er 3 (Ga 0.96 Cr 0.04 ) 5 O 12 、Sm 3 (Ga 0.96 Cr 0.04 ) 5 O 12 Dy can be found from the emission spectrum under 471nm blue light excitation and the excitation spectrum collected by monitoring the strongest emission peak thereof 3 (Ga 0.96 Cr 0.04 ) 5 O 12 、Er 3 (Ga 0.96 Cr 0.04 ) 5 O 12 、Sm 3 (Ga 0.96 Cr 0.04 ) 5 O 12 The luminous intensity of the fluorescent powder is very weak, and the fluorescent powder is not suitable for being used as far-red fluorescent powder.
Comparative example 4
This comparative example, which differs from example 1 only in that: for Gd 3 (Ga 0.96 Cr 0.04 ) 5 O 12 0.1 percent and 0.5 percent of Ce are additionally added into the fluorescent powder to synthesize Gd 3 (Ga 0.96-y Cr 0.04 Ce y ) 5 O 12 (y =0.001, 0.005), from the emission and excitation spectra shown in fig. 11 and 12, a significant drop in the luminous intensity was caused in spite of the addition of only 0.1% and 0.5% of Ce.
Test example 1
Example 1-3 fluorescent powder Gd 3 (Ga 0.96 Cr 0.04 ) 5 O 12 、Y 3 (Ga 0.96 Cr 0.04 ) 5 O 12 、Lu 3 (Ga 0.96 Cr 0.04 ) 5 O 12 Comparing with the solar spectrum shown in fig. 1 and 2 and the solar spectrum under the shade of tree, fig. 8 and 9 respectively show that the fluorescent powder of the invention can better meet the requirements. Gd is treated from the aspect of luminous thermal stability 3 (Ga 0.96 Cr 0.04 ) 5 O 12 、Y 3 (Ga 0.96 Cr 0.04 ) 5 O 12 、Lu 3 (Ga 0.96 Cr 0.04 ) 5 O 12 The Gd can be found by comparing the three fluorescent powders 3 (Ga 0.96 Cr 0.04 ) 5 O 12 The luminescence thermal stability of (a) is best, as shown in fig. 10.
Test example 2
The blue component of the solar radiation spectrum is unavoidable as shown in fig. 1 and 2. In addition, blue light is an important element for producing aesthetic optical perception, whether it is blue water or blue sky. SD male mice with the weight of 200-220 g are taken as experimental objects, and in order to simulate artificial living environment, the mice are cultured under the conditions of (a) dark shading environment, (b) blue light illumination environment, and (c) blue light + far red light (far red light LED device of example 1) illumination respectively. Under the same conditions, three groups of mice were illuminated for 4 hours each day, and the rest time was kept at normal light and shade, and the operation was continued for one week. Two days after the light irradiation is stopped, the retinas of the eyeballs of the mice are taken for HE staining, and the change of the retinal structures of the mice in each group is observed (wherein INL is the retinal inner nuclear layer, and ONL is the retinal outer nuclear layer).
Compared with the retina structure of the mouse under the shading treatment (a), as shown in fig. 23 and 24, the thickness of the inner layer and the outer layer of the retina of the mouse after the blue light LED treatment (b) is reduced, the position arrangement of the cells is irregular, and the fact that the blue light influences the normal physiological activity of the retina cells and even leads to the death of the retina cells is shown. Comparing fig. 25 and 24, it can be seen that far-red light (c) is applied while the blue LED is illuminated, the thickness of the inner and outer retinal cells of the mouse is obviously thickened, and the arrangement of retinal cells is closely regulated. The test example shows that the far-red LED device has the effect of protecting retina and can promote the damage repair and regeneration of retinal cells.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A far-red light LED device is characterized in that the LED device is prepared by mixing far-red light fluorescent powder, transparent silica gel and optional red light fluorescent powder and packaging the mixture by a packaging process;
the chemical formula of the far-red fluorescent powder is as follows: RE 3 (Ga 1-x Cr x ) 5 O 12 Wherein RE is at least one of Gd, Y and Lu, 0.001<x<0.12。
2. The far-red LED device of claim 1, wherein the far-red phosphor has the chemical formula RE 3 (Ga 1- x Cr x ) 5 O 12 Wherein x is selected from the following values: 0.03<x<0.06。
3. The far-red LED device of claim 1, wherein the method of preparing the far-red phosphor comprises:
the first step is as follows: will contain Cr 3+ The raw material of (1), the raw material containing the element Ga, the raw material containing the element RE and the fluxing agent are ground and mixed uniformly, and are calcined for the first time to obtain a first-step product;
the second step is that: and grinding the product obtained in the first step, then carrying out secondary calcination, crushing, grinding, washing, filtering and drying to obtain the far-red fluorescent powder.
4. The far-red LED device of claim 3,
the raw material containing the element RE is at least one of oxide, nitrate, oxalate and carbonate containing the element RE;
said element containing Cr 3+ Is prepared from Cr 3+ At least one of an oxide, a nitrate, an oxalate and a carbonate of (a);
the raw material containing the element Ga is at least one of oxide, nitrate, oxalate and carbonate containing the element Ga.
5. The far-red LED device of claim 3,
the operating conditions of the first calcination include: heating to 100-300 deg.C at 3-10 deg.C/min in air, maintaining for 0.3-1 hr, heating to 400-600 deg.C at 3-10 deg.C/min, maintaining for 1-3 hr, cutting off power, and furnace cooling to 25-30 deg.C;
the operating conditions of the second calcination include: heating to 850-950 deg.C at 3-10 deg.C/min in air, maintaining for 0.5-2 hr, heating to 1300-1450 deg.C at 3-8 deg.C/min, maintaining for 4-10 hr, cooling to 300-800 deg.C at 3-10 deg.C/min, cutting off power, and furnace cooling to 25-30 deg.C;
the addition amount of the fluxing agent is 0.05-2.0wt% of the total mass of the raw materials used for preparing the far-infrared fluorescent powder;
the fluxing agent is at least one of aluminum fluoride, barium fluoride, ammonium chloride and boric acid, and boric acid is preferred.
6. The far-red LED device of claim 1,
the emission wavelength range of the far-red fluorescent powder is 600-1000nm, and the emission wavelength peak value is 650-900nm;
the ratio of the dosage of the far-red fluorescent powder to the dosage of the transparent silica gel is 1 (0-0.05) to 0.2-0.8;
the chemical formula of the red phosphor is (Ca, sr) AlSiN 3 :Eu 2+ Or is M 2 Si 5 N 8 :Eu 2+ Wherein M is at least one of Sr, ca, ba and Mg.
7. The far-red LED device of claim 1, wherein the packaging process comprises: and (3) defoaming and degassing a mixture of the far-red fluorescent powder, the transparent silica gel and the optional red fluorescent powder, titrating the mixture on a blue LED chip, and baking and curing to obtain the far-red LED device.
8. The far-red LED device of claim 7, wherein the blue LED chip has an emission wavelength peak of 440-480nm.
9. The far-red LED device according to any one of claims 1 to 8, wherein the far-red LED device has an emission wavelength in the range of 600 to 1000nm and an emission wavelength peak in the range of 650 to 900nm.
10. Use of a far-red LED device according to any one of claims 1 to 9 as a light source for the prevention and treatment of myopia in adolescents.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117594581A (en) * | 2024-01-08 | 2024-02-23 | 东莞市立德达光电科技有限公司 | Light-emitting diode (LED) for photo-biological regulation and preparation method thereof |
| CN117717716A (en) * | 2023-11-09 | 2024-03-19 | 广东光阳电器有限公司 | Intelligent myopia treatment device and myopia prevention and control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117717716A (en) * | 2023-11-09 | 2024-03-19 | 广东光阳电器有限公司 | Intelligent myopia treatment device and myopia prevention and control system |
| CN117594581A (en) * | 2024-01-08 | 2024-02-23 | 东莞市立德达光电科技有限公司 | Light-emitting diode (LED) for photo-biological regulation and preparation method thereof |
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