CN111162153A - LED light source for rhythm lighting - Google Patents
LED light source for rhythm lighting Download PDFInfo
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- 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
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- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
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Abstract
The invention belongs to the technical field of semiconductor light emitting, and particularly relates to an LED light source for rhythm lighting, which comprises a blue light chip and fluorescent powder excited by the blue light chip, wherein the blue light chip comprises a first chip with the peak wavelength of 447.5-452.5nm and a second chip with the peak wavelength of 470-480nm, the fluorescent powder comprises green powder with the peak wavelength of 520-540nm, yellow powder with the peak wavelength of 540-570nm and red powder with the peak wavelength of 610-640 nm. On the basis of simultaneously increasing 470-490nm blue light and reducing 415-460nm blue light, the spectral color rendering index of the LED light source is higher than 80, so that the light quality requirement of rhythm illumination can be met, and the requirement of GB/T24908-2014 on the color rendering index of the office illumination LED lamp is met.
Description
Technical Field
The invention belongs to the technical field of semiconductor light emitting, and particularly relates to an LED light source for rhythm lighting.
Background
In recent years, with the rapid development of Light Emitting Diode (LED) technology, white LED lighting products are transitioning from conventional lighting requirements to additional value-added requirements, wherein LED Light sources with healthy lighting properties are favored by consumers.
Rhythm lighting is an emerging concept, aiming to simulate the illumination of light in nature by lighting, so that people who often work indoors can automatically adjust body rhythm according to light stimulation like outside. The research shows that the intrinsic photosensitive ganglion cells (iRGCs) contained in human retinas are closely related to the physiological rhythm of the human body, and the iRGCs can generate a series of biological effects in the human body after being sensitized. One important influencing pathway is melatonin secretion, the photosensitive effect. After receiving the optical signal, the ipRGCs transmit the signal to the pineal gland through nerve pathways such as nucleus Suprachiasmata (SCN) and the like, which affects the secretion of melatonin in human body. The research shows that the secretion of the melatonin is in inverse proportion to the illumination of light with the wavelength of 470-490nm, and the secretion of the melatonin stimulates the human body to adjust the human body to enter a rest state so as to promote the sleep. Therefore, by adjusting the ratio of light of the specific range of wavelengths in the light, the melatonin secretion level in the human body can be effectively controlled.
Generally, a person is in a working state in daytime, and the spectrum of an illumination light source contains 470-490nm blue light with higher percentage illumination, so that the secretion of melatonin is inhibited, the person is not easy to fatigue, the person works efficiently, the attention of the person is improved, the reaction time is shortened, and the positive mood is kept; when in rest, the spectrum of the illumination light source contains 470-490nm blue light with lower percentage illumination, thereby promoting the secretion of melatonin, leading people to be sleepy, tired and sleepy and entering a rest state more quickly. Thus, the light source for the rhythm lighting operation should contain a higher percentage of 470-490nm blue light.
The spectrum of the conventional LED white light product is formed by coupling blue light emitted by a GaN chip and yellow light emitted by fluorescent powder after being excited by the blue light, and the spectrum contains a large amount of 415-460nm blue light. It has been found that excessive low wavelength blue light exposure is harmful to humans. According to the GB/T20145-2006/CIE S009/E:2002 standard, when the blue light radiance reaches the class 2 or 3 specified by the standard, the damage to human eyes can be caused in a short time or in a short moment. The high-energy short-wave blue light has extremely high energy and can penetrate through crystalline lens to directly reach retina, so that atrophy and even death of retinal pigment epithelial cells are caused. The death of light-sensitive cells will lead to a loss of vision or even complete loss, which is irreversible. Meanwhile, the blue light can increase the toxin amount in the macular region of the eye and seriously threaten the health of the eyeground. Therefore, reducing the 415-460nm low-wavelength blue light content in the illumination light source is an effective means for protecting the health of vision.
The color rendering index refers to the ability of the lamp light to reduce the color of an object. According to the standard GB/T24908-2014, the color rendering index of the office lighting LED lamp is limited to be not lower than 80, so that the light quality of the emission spectrum also needs to be fully considered in the process of designing the light source. The conventional LED white light product is mostly formed by coupling single blue light excited yellow fluorescent powder, while the peak value range of the excitation wavelength of the common commercial fluorescent powder is 447.5-455nm, aiming at the LED light source of rhythm illumination, if a single blue light chip with the peak value range of the emission wavelength being 447.5-455nm is adopted to excite the fluorescent powder, the obtained emission spectrum is difficult to obtain higher percentage illumination at 470-490 nm; if a single blue light chip with the peak emission wavelength range of 470-480nm is adopted to excite the fluorescent powder, the excitation efficiency is low, the ratio of green light, yellow light and red light with higher wavelength in the obtained emission spectrum is low, and the color rendering index is difficult to improve.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an LED light source for rhythm lighting, aiming at solving the technical problem that the illuminance of 415-460nm band and 470-490nm band in the prior light source is difficult to meet the requirement of rhythm lighting.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an LED light source for rhythm lighting, which comprises a blue light chip and fluorescent powder excited by the blue light chip, wherein the blue light chip comprises a first chip with the peak wavelength of 447.5-452.5nm and a second chip with the peak wavelength of 470-480nm, the fluorescent powder comprises green powder with the peak wavelength of 520-540nm, yellow powder with the peak wavelength of 540-570nm and red powder with the peak wavelength of 610-640 nm.
The LED light source for rhythm illumination provided by the invention excites green powder, yellow powder and red powder through the double blue light chip with a special waveband, so that an emission spectrum comprises an LED spectrum excited by double blue light, the spectrum comprises blue light with the higher percentage illumination of 470-doped 490nm and blue light with the lower percentage illumination of 415-doped 460nm, the blue light with the high illumination of 470-doped 490nm can be used for the requirement of rhythm illumination, the secretion of melatonin is inhibited, the working efficiency of people is improved, the blue light with the low illumination of 415-doped 460nm can reduce the harm of the blue light, and the eyesight health is protected; moreover, on the basis of simultaneously increasing 470-490nm blue light and reducing 415-460nm blue light, the spectral color rendering index is higher than 80, so that the light quality requirement of the rhythm illumination can be met, and the requirement of GB/T24908-2014 on the color rendering index of the office illumination LED lamp is met, therefore, the LED light source has a good application prospect in the field of the rhythm illumination.
Drawings
FIG. 1 is a graph of the relationship between iprGC and illumination wavelength sensitivity in the present invention.
Fig. 2 is a spectrum diagram of a rhythm lighting LED light source provided in embodiment 1 of the present invention.
Fig. 3 is a spectrum diagram of a rhythm lighting LED light source provided in embodiment 2 of the present invention.
Fig. 4 is a spectrum diagram of a rhythm lighting LED light source provided in embodiment 3 of the present invention.
Fig. 5 is a spectrum diagram of a rhythm lighting LED light source provided in embodiment 4 of the present invention.
Fig. 6 is a spectrum diagram of a rhythm lighting LED light source provided in embodiment 5 of the present invention.
Fig. 7 is a spectrum diagram of a rhythm lighting LED light source provided in embodiment 6 of the present invention.
Fig. 8 is a spectrum diagram of a rhythm lighting LED light source provided in embodiment 7 of the present invention.
Fig. 9 is a spectrum diagram of a rhythm lighting LED light source provided in embodiment 8 of the present invention.
Fig. 10 is a spectrum diagram of a rhythm lighting LED light source provided in embodiment 9 of the present invention.
Fig. 11 is a spectrum diagram of a rhythm lighting LED light source provided in embodiment 10 of the present invention.
Fig. 12 is a spectrum diagram of a rhythm lighting LED light source provided in embodiment 11 of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
In one aspect, an embodiment of the present invention provides an LED light source for rhythm lighting, including a blue light chip and a phosphor excited by the blue light chip, where the blue light chip includes a first chip with a peak wavelength of 447.5-452.5nm and a second chip with a peak wavelength of 470-480nm, the phosphor includes a green powder with a peak wavelength of 520-540nm, a yellow powder with a peak wavelength of 540-570nm and a red powder with a peak wavelength of 610-640 nm.
The LED light source for rhythm illumination provided by the embodiment of the invention excites green powder, yellow powder and red powder through the double blue light chip with a special waveband, so that an emission spectrum comprises an LED spectrum excited by double blue light, wherein the spectrum comprises 470-doped 490nm blue light with higher percentage illumination and 415-doped 460nm blue light with lower percentage illumination, the 470-doped 490nm blue light with high illumination can be used for the requirement of rhythm illumination, the secretion of melatonin is inhibited, the working efficiency of people is improved, and the 415-doped 460nm blue light with low illumination can reduce the harm of blue light and protect the eyesight health; moreover, on the basis of simultaneously increasing 470-490nm blue light and reducing 415-460nm blue light, the spectral color rendering index is higher than 80, so that the light quality requirement of the rhythm illumination can be met, and the requirement of GB/T24908-2014 on the color rendering index of the office illumination LED lamp is met, therefore, the LED light source has a good application prospect in the field of the rhythm illumination.
In the LED light source for rhythm lighting provided by the embodiment of the invention, the emission peak value of the first chip is 447.5-452.5nm, and the blue light with the wavelength is in the peak value range of the excitation spectrum of the fluorescent powder excited by the blue light chip, so that the fluorescent powder can be efficiently excited, green light, yellow light and red light with higher wavelength in the spectrum can be supplemented, and the proportion of 415-460nm low-wavelength blue light in the spectrum can be reduced; the emission peak of the second chip is 470-480nm, the blue light with the wavelength is not in the peak range of the excitation spectrum of the fluorescent powder excited by the blue light chip, and the blue light with the wavelength of 470-490nm is mainly supplemented in the spectrum. For the second chip, if the chip with the peak wavelength below 470nm is selected and the same fluorescent powder is used, the blue light emitted by the chip and the fluorescent powder generate high-efficiency coupling effect, which can cause the ratio of the blue light in the 470-480nm band to be reduced, so that the peak wavelength selected by the second chip is located in the 470-480nm band.
The color rendering index refers to the reduction capability of the lamp light on the object color, and according to the standard GB/T24908-2014, the color rendering index of the office lighting LED lamp is limited to be not less than 80, so that the light quality of an emission spectrum also needs to be fully considered in the process of designing a light source. At present, simply increasing 470-490nm blue light or decreasing 415-460nm blue light may cause the color rendering index to decrease, which is difficult to meet the national standard. Therefore, when designing the light source, a certain amount of blue light needs to be reserved to improve the color rendering index. On the basis of simultaneously increasing 470-490nm blue light and reducing 415-460nm blue light, the spectral color rendering index of the LED light source provided by the embodiment of the invention is higher than 80, so that the light quality requirement of rhythm illumination can be well met, and the requirement of GB/T24908-2014 on the color rendering index of the office illumination LED lamp is met.
FIG. 1 is a graph of the relationship between iprGC and illumination wavelength sensitivity. From FIG. 1, it can be seen that iprGC is most sensitive to blue light stimulation with the wavelength of 470-490nm, and the melatonin secretion is most inhibited under the irradiation of the wavelength band. Therefore, the blue light occupation ratio of 470-490nm wavelength can be improved, the melatonin secretion level of a human body can be effectively reduced, and the working spirit and state of a person in the illumination environment can be improved.
The LED light source emission spectrum for the rhythm illumination provided by the invention is excited by adopting double blue light chips, the wavelengths of the first chip and the second chip are obviously different, the excitation efficiency of the fluorescent powder is different, and the intensity ratio among the blue light chips, the concentration ratio of the fluorescent powder and the matching action between the blue light chips and the fluorescent powder are required to be accurately adjusted so as to meet the light quality requirement of the rhythm illumination and the requirement of reducing the blue light hazard and meet the requirement of GB/T24908 and 2014 on the color rendering index of the office illumination LED lamp.
In one embodiment, the blue light chip comprises a plurality of the first chips and a plurality of the second chips, and the first chips and the second chips are connected in series, in parallel or in a combination of series and parallel. Specifically, in one embodiment, the difference between the operating voltages of the first chip and the second chip is less than or equal to 5%; and the peak intensity ratio of the first chip to the second chip under the same working condition is (0.3-0.5): 1.0. If the peak intensity of the first chip is too high, the proportion of blue light with the wavelength of 415-460nm in the obtained emission spectrum will increase, increasing the risk of blue light hazard, and therefore, the peak intensity of the second chip is greater than that of the first chip.
In one embodiment, the peak wavelength of the first chip is 447.5-452.5nm, and the peak wavelength of the second chip is 472.5-477.5 nm. The peak wavelength is excited by the double blue light chips, and the obtained excitation effect is better.
In one embodiment, the sum of the green powder and the yellow powder is 93-97% by mass and the red powder is 3-7% by mass, based on 100% by mass of the total phosphor powder. Furthermore, the total weight of the fluorescent powder is 100%, wherein the mass percentage of green powder in the fluorescent powder is 17-85%, the mass percentage of yellow powder is 8-80%, and the mass percentage of red powder is 3-7%.
In one embodiment, the green powder with the peak wavelength between 520-540nm is rare earth doped yttrium aluminum garnet type fluorescent powder; the yellow powder with the peak wavelength between 540-570nm is rare earth doped aluminate fluorescent powder; the red powder with the peak wavelength between 610-640nm is rare earth doped silicon-based nitride fluorescent powder. Specifically, in the rare earth-doped yttrium aluminum garnet type fluorescent powder, the doped rare earth elements comprise one or more of rare earth elements such as Ce, Ga, Lu, Dy, Tb, Ln, Eu and the like. In the rare earth doped aluminate fluorescent powder, the doped rare earth elements comprise one or more of rare earth elements such as Ce, Ga, Lu, Dy, Tb, Ln, Eu and the like. The rare earth doped silicon-based nitride fluorescent powder comprises one or more of alkaline earth metal elements such as Ca, Sr and Ba and one or more of rare earth elements such as Eu, Tm and Dy. Further, as a preferred embodiment, the green phosphor is preferably Lu3Al5O12: ce, the yellow phosphor is preferably Y3(Al,Ga)5O12Ce, the red phosphor is preferably (Sr, Ca) AlSiN3Eu. The series of fluorescent powder has stable structure, better matching performance among the fluorescent powder and higher external quantum efficiency.
In one embodiment, the phosphor is mixed with the silica gel to form a phosphor gel, and the phosphor gel is uniformly coated around the chip. The chip and the fluorescent glue are arranged in the diode bracket with a specific bowl shape, and the chip is electrically connected with the bracket.
The LED spectrum provided by the invention is a double blue light excitation LED spectrum, and through the spectral coupling between the light emitting chip and the fluorescent powder, on the premise of ensuring that the color rendering index of the spectrum is higher than 80, the blue light content of the 470-490nm waveband in the spectrum of the LED light source is controllable, and the spectrum has lower blue light emission in the 415-460nm waveband. Specifically, the ratio of the luminous flux of blue light in 470-490nm waveband is more than 10%, which is increased by more than 150% compared with the conventional lighting product; the ratio of the luminous flux of the blue light in the 415-460nm waveband is less than 12%, and is reduced by more than 40% compared with the conventional lighting product. The spectrum can adjust the function of a human body, inhibit melatonin secretion, enable people not to be easily tired, work efficiently, reduce blue light harm, and meet the national standard requirement, wherein the color rendering index of the spectrum is higher than 80.
The invention is described in further detail with reference to a part of the test results, which are described in detail below with reference to specific examples.
Example 1
A dual blue-excited LED light source: the color temperature of the emission spectrum of the double blue light excitation LED of the light source is 4000K, and the color rendering index is larger than 80.
The double blue light excitation LED light source comprises two blue light chips, wherein the first blue light chip is a blue light chip with the peak wavelength of 447.5-452.5nm, the second blue light chip is a blue light chip with the peak wavelength of 472.5-477.5nm, the peak intensity ratio is 0.5:1.0, and the voltage difference is 5%.
The double blue light excitation LED light source further comprises fluorescent powder, wherein the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 52%, the rare earth doped aluminate type fluorescent powder accounts for 41%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 7% of the total weight of the fluorescent powder as 100%.
The spectrum of the double blue light excitation LED light source is shown in figure 2.
Example 2
A dual blue-excited LED light source: the color temperature of the emission spectrum of the double blue light excitation LED of the light source is 5000K, and the color rendering index is larger than 80.
The double blue light excitation LED light source comprises two blue light chips, wherein the first blue light chip is a blue light chip with the peak wavelength of 447.5-452.5nm, the second blue light chip is a blue light chip with the peak wavelength of 472.5-477.5nm, the peak intensity ratio is 0.4:1.0, and the voltage difference is 5%.
The double blue light excitation LED light source further comprises fluorescent powder, wherein the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 35%, the rare earth doped aluminate type fluorescent powder accounts for 59%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 6% of the total weight of the fluorescent powder as 100%.
The spectrum of the double blue light excitation LED light source is shown in figure 3.
Example 3
A dual blue-excited LED light source: the color temperature of the double blue light excitation LED emission spectrum of the light source is 5700K, and the color rendering index is larger than 80.
The double blue light excitation LED light source comprises two blue light chips, wherein the first blue light chip is a blue light chip with the peak wavelength of 447.5-452.5nm, the second blue light chip is a blue light chip with the peak wavelength of 472.5-477.5nm, the peak intensity ratio is 0.4:1.0, and the voltage difference is 4%.
The double blue light excitation LED light source further comprises fluorescent powder, wherein the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 37%, the rare earth doped rare earth aluminate type fluorescent powder accounts for 57%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 6% of the total weight of the fluorescent powder as 100%.
The spectrum of the double blue light excitation LED light source is shown in FIG. 4.
Example 4
A dual blue-excited LED light source: the color temperature of the double blue light excitation LED emission spectrum of the light source is 6500K, and the color rendering index is larger than 80.
The double blue light excitation LED light source comprises two blue light chips, wherein the first blue light chip is a blue light chip with the peak wavelength of 447.5-452.5nm, the second blue light chip is a blue light chip with the peak wavelength of 472.5-477.5nm, the peak intensity ratio is 0.3:1.0, and the voltage difference is 3%.
The double blue light excitation LED light source further comprises fluorescent powder, wherein the total weight of the fluorescent powder is 100%, the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 17%, the rare earth doped aluminate type fluorescent powder accounts for 80%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 3%.
The spectrum of the double blue light excitation LED light source is shown in FIG. 5.
Example 5
A dual blue-excited LED light source: the color temperature of the emission spectrum of the double blue light excitation LED of the light source is 4000K, and the color rendering index is larger than 80.
The double blue light excitation LED light source comprises two blue light chips, wherein the first blue light chip is a blue light chip with the peak wavelength of 447.5-452.5nm, the second blue light chip is a blue light chip with the peak wavelength of 472.5-477.5nm, the peak intensity ratio is 0.5:1.0, and the voltage difference is 5%.
The double blue light excitation LED light source further comprises fluorescent powder, wherein the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 85%, the rare earth doped aluminate type fluorescent powder accounts for 9%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 6% of the total weight of the fluorescent powder as 100%.
The spectrum of the double blue light excitation LED light source is shown in FIG. 6.
Example 6
A dual blue-excited LED light source: the color temperature of the emission spectrum of the double blue light excitation LED of the light source is 5000K, and the color rendering index is larger than 80.
The double blue light excitation LED light source comprises two blue light chips, wherein the first blue light chip is a blue light chip with the peak wavelength of 447.5-452.5nm, the second blue light chip is a blue light chip with the peak wavelength of 472.5-477.5nm, the peak intensity ratio is 0.4:1.0, and the voltage difference is 5%.
The double blue light excitation LED light source further comprises fluorescent powder, and by taking the total weight of the fluorescent powder as 100%, the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 81%, the rare earth doped aluminate type fluorescent powder accounts for 12%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 7%.
The spectrum of the double blue light excitation LED light source is shown in FIG. 7.
Example 7
A dual blue-excited LED light source: the color temperature of the double blue light excitation LED emission spectrum of the light source is 5700K, and the color rendering index is larger than 80.
The double blue light excitation LED light source comprises two blue light chips, wherein the first blue light chip is a blue light chip with the peak wavelength of 447.5-452.5nm, the second blue light chip is a blue light chip with the peak wavelength of 472.5-477.5nm, the peak intensity ratio is 0.4:1.0, and the voltage difference is 4%.
The double blue light excitation LED light source further comprises fluorescent powder, wherein the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 84%, the rare earth doped aluminate type fluorescent powder accounts for 9%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 7% of the total weight of the fluorescent powder as 100%.
The spectrum of the double blue light excitation LED light source is shown in FIG. 8.
Example 8
A dual blue-excited LED light source: the color temperature of the double blue light excitation LED emission spectrum of the light source is 6500K, and the color rendering index is larger than 80.
The double blue light excitation LED light source comprises two blue light chips, wherein the first blue light chip is a blue light chip with the peak wavelength of 447.5-452.5nm, the second blue light chip is a blue light chip with the peak wavelength of 472.5-477.5nm, the peak intensity ratio is 0.3:1.0, and the voltage difference is 3%.
The double blue light excitation LED light source further comprises fluorescent powder, wherein the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 85%, the rare earth doped aluminate type fluorescent powder accounts for 10%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 5% of the total weight of the fluorescent powder as 100%.
The spectrum of the double blue light excitation LED light source is shown in FIG. 9.
Example 9
A dual blue-excited LED light source: the color temperature of the emission spectrum of the double blue light excitation LED of the light source is 4000K, and the color rendering index is larger than 80.
The double blue light excitation LED light source comprises two blue light chips, wherein the first chip is a blue light chip with the peak wavelength of 447.5-452.5nm, the second chip is a blue light chip with the peak wavelength of 475-480nm, the peak intensity ratio is 0.4:1.0, and the voltage difference is 5%.
The double blue light excitation LED light source further comprises fluorescent powder, and by taking the total weight of the fluorescent powder as 100%, the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 47%, the rare earth doped aluminate type fluorescent powder accounts for 46%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 7%.
The spectrum of the double blue light excitation LED light source is shown in FIG. 10.
Example 10
A dual blue-excited LED light source: the color temperature of the emission spectrum of the double blue light excitation LED of the light source is 5000K, and the color rendering index is larger than 80.
The double blue light excitation LED light source comprises two blue light chips, wherein the first chip is a blue light chip with the peak wavelength of 447.5-452.5nm, the second chip is a blue light chip with the peak wavelength of 475-480nm, the peak intensity ratio is 0.4:1.0, and the voltage difference is 4%.
The double blue light excitation LED light source further comprises fluorescent powder, wherein the total weight of the fluorescent powder is 100%, the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 46%, the rare earth doped aluminate type fluorescent powder accounts for 47%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 7%.
The spectrum of the double blue light excitation LED light source is shown in FIG. 11.
Example 11
A dual blue-excited LED light source: the color temperature of the emission spectrum of the double blue light excitation LED of the light source is 5000K, and the color rendering index is larger than 80.
The double blue light excitation LED light source comprises two blue light chips, wherein the first chip is a blue light chip with the peak wavelength of 447.5-452.5nm, the second chip is a blue light chip with the peak wavelength of 475-480nm, the peak intensity ratio is 0.5:1.0, and the voltage difference is 4%.
The double blue light excitation LED light source further comprises fluorescent powder, wherein the total weight of the fluorescent powder is 100%, the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 66%, the rare earth doped aluminate type fluorescent powder accounts for 30%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 4%.
The spectrum of the double blue light excitation LED light source is shown in FIG. 12.
Comparative example 1
A single blue light excitation LED conventional lighting source: the color temperature of the emission spectrum of the blue light excitation LED of the light source is 4000K, and the color rendering index is larger than 80.
The blue light excitation LED light source comprises a blue light chip, and the chip is a blue light chip with the peak wavelength of 455-457.5 nm.
The single blue light excitation LED light source also comprises fluorescent powder, wherein the total weight of the fluorescent powder is 100%, the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 59%, the rare earth doped aluminate type fluorescent powder accounts for 36%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 5%.
Comparative example 2
A single blue light excitation LED conventional lighting source: the color temperature of the emission spectrum of the blue light excitation LED of the light source is 5000K, and the color rendering index is larger than 80.
The blue light excitation LED light source comprises a blue light chip, and the chip is a blue light chip with the peak wavelength of 452.5-455 nm.
The single blue light excitation LED light source also comprises fluorescent powder, and based on the total weight of the fluorescent powder as 100%, the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 69%, the rare earth doped aluminate type fluorescent powder accounts for 25%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 6%.
Comparative example 3
A single blue light excitation LED conventional lighting source: the color temperature of the blue light excitation LED emission spectrum of the light source is 5700K, and the color rendering index is larger than 80.
The blue light excitation LED light source comprises a blue light chip, and the chip is a blue light chip with the peak wavelength of 452.5-455 nm.
The single blue light excitation LED light source also comprises fluorescent powder, wherein the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 86%, the rare earth doped aluminate type fluorescent powder accounts for 9%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 5% of the total weight of the fluorescent powder as 100%.
Comparative example 4
A single blue light excitation LED conventional lighting source: the color temperature of the blue light excitation LED emission spectrum of the light source is 6500K, and the color rendering index is larger than 80.
The blue light excitation LED light source comprises a blue light chip, and the chip is a blue light chip with the peak wavelength of 452.5-455 nm.
The single blue light excitation LED light source also comprises fluorescent powder, and based on the total weight of the fluorescent powder as 100%, the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 69%, the rare earth doped aluminate type fluorescent powder accounts for 25%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 6%.
Comparative example 5
A dual blue-excited LED light source: the color temperature of the emission spectrum of the double blue light excitation LED of the light source is 4000K, and the color rendering index is larger than 80.
The double blue light excitation LED light source comprises two blue light chips, wherein the first chip is a blue light chip with the peak wavelength of 447.5-452.5nm, the second chip is a blue light chip with the peak wavelength of 457.5-462.5nm, the peak intensity ratio is 0.4:1.0, and the voltage difference is 3%.
The double blue light excitation LED light source further comprises fluorescent powder, wherein the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 86%, the rare earth doped aluminate type fluorescent powder accounts for 10%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 4% of the total weight of the fluorescent powder as 100%.
Comparative example 6
A dual blue-excited LED light source: the color temperature of the emission spectrum of the double blue light excitation LED of the light source is 5000K, and the color rendering index is larger than 80.
The double blue light excitation LED light source comprises two blue light chips, wherein the first chip is a blue light chip with the peak wavelength of 447.5-452.5nm, the second chip is a blue light chip with the peak wavelength of 457.5-462.5nm, the peak intensity ratio is 0.8:1.0, and the voltage difference is 3%.
The double blue light excitation LED light source further comprises fluorescent powder, wherein the rare earth doped yttrium aluminum garnet type fluorescent powder accounts for 88%, the rare earth doped aluminate type fluorescent powder accounts for 5%, and the rare earth doped silicon-based nitride type fluorescent powder accounts for 7% of the total weight of the fluorescent powder as 100%.
Performance testing
The LED light source test data for the above examples and comparative examples are shown in table 1 below:
TABLE 1
As can be seen from Table 1, compared with the comparative example, in the spectrum scheme of the double blue light LED provided by the embodiment of the invention, under the conditions that the color rendering index is higher than 80 and the color temperature is the same, the peak wavelength is located at about 480nm, and the luminous flux ratio of the 470-490nm blue light is greatly improved by more than 150%; meanwhile, the luminous flux ratio of 415-460nm blue light is greatly reduced by more than 40%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An LED light source for rhythm illumination comprises a blue light chip and fluorescent powder excited by the blue light chip, and is characterized in that the blue light chip comprises a first chip with a peak wavelength of 447.5-452.5nm and a second chip with a peak wavelength of 470-480nm, the fluorescent powder comprises green powder with a peak wavelength of 520-540nm, yellow powder with a peak wavelength of 540-570nm and red powder with a peak wavelength of 610-640 nm.
2. The LED light source of claim 1 wherein the blue chip comprises a plurality of the first chips and a plurality of the second chips, the first and second chips being connected in series, in parallel, or a combination thereof.
3. The LED light source of claim 1 wherein the difference in operating voltages of the first chip and the second chip is less than or equal to 5%; and the peak intensity ratio of the first chip to the second chip under the same working condition is (0.3-0.5): 1.0.
4. The LED light source of claim 1 wherein the peak wavelength of the first die is 447.5-452.5nm and the peak wavelength of the second die is 472.5-477.5 nm.
5. The LED light source of claim 1 wherein the sum of the green powder and yellow powder is 93-97% and the red powder is 3-7% by weight, based on 100% by weight of the phosphor.
6. The LED light source according to claim 5, wherein the phosphor comprises 17-85% by mass of green powder, 8-80% by mass of yellow powder and 3-7% by mass of red powder, based on 100% by mass of the phosphor.
7. The LED light source of any of claims 1-6 wherein the green powder is a rare earth doped yttrium aluminum garnet type phosphor; and/or the yellow powder is rare earth doped aluminate fluorescent powder; and/or the presence of a gas in the gas,
the red powder is rare earth doped silicon-based nitride fluorescent powder.
8. The LED light source of claim 7 wherein the doped rare earth elements in the rare earth doped yttrium aluminum garnet type phosphor comprise one or more of Ce, Ga, Lu, Dy, Tb, Ln, and Eu.
9. The LED light source of claim 7 wherein the doped rare earth elements in the rare earth doped aluminate-type phosphor include one or more of Ce, Ga, Lu, Dy, Tb, Ln, and Eu.
10. The LED light source of claim 7 wherein the rare earth doped silicon-based nitride phosphor contains one or more alkaline earth elements of Ca, Sr, and Ba and one or more doped rare earth elements of Eu, Tm, and Dy.
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| CN202010006140.5A CN111162153B (en) | 2020-01-03 | 2020-01-03 | LED light source for rhythm lighting |
| PCT/CN2020/089164 WO2020248748A1 (en) | 2020-01-03 | 2020-05-08 | Led light source for rhythm lighting |
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| WO2020248748A1 (en) | 2020-12-17 |
| CN111162153B (en) | 2021-02-23 |
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