3V stepless dimming pure white light LED structure

Abstract

The invention belongs to the technical field of LEDs, and particularly relates to a 3V stepless dimming pure white light LED structure which comprises a first LED light source, a second LED light source and a third LED light source which are connected in series, in parallel or in series-parallel connection. The first LED light source comprises a first LED wafer and first fluorescent glue, and the first fluorescent glue is formed by mixing glue, green powder and red powder; the second LED light source comprises a second LED wafer and second fluorescent glue; the second fluorescent glue is formed by mixing glue, blue-green powder, green powder and red powder; the third LED light source comprises a third LED wafer and third fluorescent glue, and the third fluorescent glue is formed by mixing glue, green powder and red powder. According to the 3V electrodeless dimming positive white light LED structure provided by the embodiment of the invention, the problem of unstable dimming spectrum of a 5700K LED light source product in the prior art can be effectively solved, and meanwhile, the manufacturing cost of the product can be saved.

Description

Technical Field

[0001] The invention relates to the technical field of LEDs, in particular to a 3V stepless dimming positive white light LED structure. Background Art

[0002] The 3V LED light source of the prior art generally uses three LED chips packaged together, such as Figure 1 As shown, the structure shown in the figure includes a pin 10, a first LED chip 11, a second LED chip 12, a third LED chip, a bowl 14 and a bracket 15. Further, the test data of the above-mentioned existing LED light source with a light color of 5700K is shown in Table 1 below:

[0003]

[0004] Among them, the Ra, R9, and R12 of the existing LED light sources are unstable, resulting in unstable color quality. Figure 2 It can be seen that the spectrum of the above existing LED light source is unstable from low to high current. The smaller the adjusted current, the more unstable the spectrum. Moreover, after dimming, the light color is not good due to the large spectrum fluctuation, which is extremely annoying for users. Therefore, it is extremely unsuitable in dimming lamp products. Summary of the invention

[0005] The purpose of the present invention is to provide a 3V stepless dimming positive white light LED structure, which can solve the problems existing in the above-mentioned prior art, has the advantages of stable dimming spectrum, and can save production costs.

[0006] The present invention adopts the following technical solution to solve the above technical problems: providing a 3V stepless dimming positive white light LED structure, comprising a first LED light source, a second LED light source and a third LED light source connected in series, in parallel or in series and in parallel;

[0007] The first LED light source includes a first LED chip and a first fluorescent glue encapsulating the first LED chip, the main wavelength of the first LED chip is 440-445nm, and the first fluorescent glue includes a mixture of glue, green powder with an emission peak wavelength of 530-545nm, and red powder with an emission peak wavelength of 650-670nm;

[0008] The second LED light source includes a second LED chip and a second fluorescent glue encapsulating the second LED chip, the main wavelength of the second LED chip is 450-455nm, and the second fluorescent glue includes glue, blue-green powder with an emission peak wavelength of 490-500nm, green powder with an emission peak wavelength of 530-545nm, and red powder with an emission peak wavelength of 650-670nm;

[0009] The third LED light source includes a third LED chip and a third fluorescent glue encapsulating the third LED chip. The main wavelength of the third LED chip is 460-470nm. The third fluorescent glue includes a mixture of glue, green powder with an emission peak wavelength of 530-545nm, and red powder with an emission peak wavelength of 650-670nm.

[0010] Optionally, the number ratio of the first LED light source: the second LED light source: the third LED light source=1:(1-2):(1-2).

[0011] Optionally, in the first fluorescent glue, the mass ratio of glue: green powder with an emission peak wavelength of 530-545 nm: red powder with an emission peak wavelength of 650-670 nm is 11: (4.2-5.2): (0.28-0.38).

[0012] Optionally, in the second fluorescent glue, the mass ratio of glue: blue-green powder with an emission peak wavelength of 490-500nm: green powder with an emission peak wavelength of 530-540nm: red powder with an emission peak wavelength of 650-670nm = 11: (1.3-2.3): (2.0-3.0): (0.33-0.43).

[0013] Optionally, in the third fluorescent glue, the mass ratio of glue: green powder with an emission peak wavelength of 530-545 nm: red powder with an emission peak wavelength of 650-670 nm is 11: (3.8-4.8): (0.4-0.5).

[0014] Optionally, the green powder with an emission peak wavelength of 530-545 nm is composed of Lu3Al5O 12 :Ce 3+ , half-wave width is 80-120nm; the emission peak wavelength is 650-670nm, the composition of the red powder is CaAlSiN3:Eu, and the half-wave width is 80-120nm.

[0015] Optionally, the composition of the blue-green powder with an emission peak wavelength of 490-500 nm is Lu3Al5O 12 :Ce 3+ , half-wave width is 40-80nm; the composition of the green powder with an emission peak wavelength of 530-545nm is Lu3Al5O 12 :Ce 3+ , half-wave width is 80-120nm; the red powder with an emission peak wavelength of 650-670nm is composed of CaAlSiN3:Eu, and the half-wave width is 80-120nm.

[0016] Optionally, the green powder with an emission peak wavelength of 530-545 nm is composed of Lu3Al5O 12 :Ce 3+ , half-wave width is 80-120nm; the red powder with an emission peak wavelength of 650-670nm is composed of CaAlSiN3:Eu, and the half-wave width is 80-120nm.

[0017] Compared with the prior art, the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention has at least the following beneficial effects:

[0018] 1. The SSI (350-830nm) spectrum similarity of the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention is >78% with the same color temperature 5700K;

[0019] 2. The 3V stepless dimming positive white light LED structure provided in the embodiment of the present invention has Ra>95 and R1-R15>90 after light combination;

[0020] 3. The TLCI-2012 TV lighting index of the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention is >98;

[0021] 4. The GAI-BB relative blackbody trajectory color gamut area index of the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention is >95;

[0022] 5. The TM-30-15 of the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention has Rg>95, Rf>90, Rf,skin>90;

[0023] 6. The S / P Ratio and M / P ratio of the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention are basically the same as the sunlight with the same color temperature, with a healthier rhythm and a clearer field of vision;

[0024] 7. The blue light hazard efficiency K of the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention B，V Lower than the same color temperature of 5700K, low blue light hazard, meets the IEC-62471RGO exemption requirements, and is healthier for eye protection.

[0025] The 3V stepless dimming positive white light LED structure provided in the embodiment of the present invention can effectively solve the problem of unstable dimming spectrum existing in the LED light source products in the prior art, and at the same time can save the production cost of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of a 5700K 3V LED light source in the prior art.

[0027] Figure 2 This is a graph showing how the spectrum of a 5700K 3V LED light source in the prior art varies with current.

[0028] Figure 3 A schematic diagram of a 3V stepless dimming positive white light LED structure provided in an embodiment of the present invention.

[0029] Figure 4 This is a circuit diagram of a 3V stepless dimming positive white light LED structure provided in an embodiment of the present invention.

[0030] Figure 5 This is a spectrum diagram of the first LED chip of the 3V stepless dimming positive white light LED structure provided in an embodiment of the present invention.

[0031] Figure 6 This is a spectrum test report diagram of the first LED chip of the 3V stepless dimming positive white light LED structure provided in an embodiment of the present invention.

[0032] Figure 7 A comparison chart of the blue light hazard efficiency of the first LED chip of the 3V stepless dimming positive white light LED structure provided in an embodiment of the present invention.

[0033] Figure 8 This is a spectrum diagram of the second LED chip of the 3V stepless dimming positive white light LED structure provided in an embodiment of the present invention.

[0034] Fig. 9 This is a spectrum test report diagram of the second LED chip of the 3V stepless dimming positive white light LED structure provided in an embodiment of the present invention.

[0035] Fig.10 A comparison chart of the blue light hazard efficiency of the second LED chip of the 3V stepless dimming positive white light LED structure provided in an embodiment of the present invention.

[0036] Fig.11 This is a spectrum diagram of the third LED chip of the 3V stepless dimming positive white light LED structure provided in an embodiment of the present invention.

[0037] Fig.12 This is a spectrum test report diagram of the third LED chip of the 3V stepless dimming positive white light LED structure provided in an embodiment of the present invention.

[0038] Fig.13 A comparison chart of the blue light hazard efficiency of the third LED chip of the 3V stepless dimming positive white light LED structure provided in an embodiment of the present invention.

[0039] Fig.14 This is a spectrum diagram of a 3V stepless dimming positive white light LED structure according to an embodiment of the present invention.

[0040] Fig.15A comparison chart of the blue light hazard efficiency of a 3V stepless dimming positive white light LED structure provided in an embodiment of the present invention.

[0041] Fig.16 This is a graph showing the spectrum of a 3V stepless dimming positive white light LED structure as a function of current provided in an embodiment of the present invention.

[0042] Fig.17 This is a binning diagram of the 3V stepless dimming positive white light LED structure provided in an embodiment of the present invention.

[0043] Reference numerals:

[0044] 11 - first LED chip 12 - second LED chip 13 - third LED chip 14 - bowl 15 - bracket. DETAILED DESCRIPTION

[0045] The following is combined with Figure 3-17 The technical solution of the present invention is further described in detail. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Although this specification is described according to the implementation methods, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should take the specification as a whole. The various embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0046] It should be noted that the blue light hazard efficiency K B，V To calculate, that is, the blue light hazard weighted radiance L B The ratio of the corresponding photometric value is calculated as:

[0047]

[0048] Among them, K m =683lm / W, V(λ) is the spectral luminous efficiency (or visibility function), and B(λ) is the blue light hazard weighting function. K B，V Characterizes the relative amount of blue light components in visible radiation. When the brightness of lighting products is the same, K B，V The higher it is, the more likely the light source is to harm the retina.

[0049] It should be noted that the rated voltage of LED chips with a main wavelength of 440-480nm is between 2.6-3.3V, which is generally referred to as a 3V light source in the industry.

[0050] like Figures 3-4As shown, a 3V stepless dimming positive white light LED structure provided by an embodiment of the present invention includes a first LED light source, a second LED light source and a third LED light source connected in series, in parallel or in series and in parallel.

[0051] The first LED light source includes a first LED chip and a first fluorescent glue encapsulating the first LED chip. The main wavelength of the first LED chip is 440-445nm. The first fluorescent glue includes a mixture of glue, green powder with an emission peak wavelength of 530-545nm, and red powder with an emission peak wavelength of 650-670nm.

[0052] The second LED light source includes a second LED chip and a second fluorescent glue encapsulating the second LED chip. The main wavelength of the second LED chip is 450-455nm. The second fluorescent glue includes a mixture of glue, blue-green powder with an emission peak wavelength of 490-500nm, green powder with an emission peak wavelength of 530-545nm and red powder with an emission peak wavelength of 650-670nm.

[0053] The third LED light source includes a third LED chip and a third fluorescent glue encapsulating the third LED chip. The main wavelength of the third LED chip is 460-470nm. The third fluorescent glue includes a mixture of glue, green powder with an emission peak wavelength of 530-545nm, and red powder with an emission peak wavelength of 650-670nm.

[0054] See Figure 3 As shown, the first LED light source, the second LED light source and the third LED light source all further include pins 10, a bowl 14 and a bracket 15. Among them, the first LED chip 11 with a main wavelength of 440-445nm is packaged in the bowl 14 of the first LED light source, the second LED chip 12 with a main wavelength of 450-455nm is packaged in the bowl 14 of the second LED light source, and the third LED chip with a main wavelength of 460-470nm is packaged in the bowl 14 of the third LED light source.

[0055] The 3V stepless dimming positive white light LED structure provided in the embodiment of the present invention can effectively solve the problem of unstable dimming spectrum existing in the prior art 5700K LED light source products, and at the same time can save the production cost of the product.

[0056] Specifically, the number ratio of the first LED light source: the second LED light source: the third LED light source is 1: (1-2): (1-2). In this embodiment, the first LED light source, the second LED light source, and the third LED light source are attached to the aluminum substrate in a number ratio of 1: (1-2): (1-2), and assembled into a complete lamp. The photoelectric parameters of the entire lamp are tested, and the photoelectric parameters meet the high color quality parameters of Ra>97, color tolerance SDCM<3, Rg>97, and Rf>95.

[0057] For example, when the ratio of the first LED light source: the second LED light source: the third LED light source is 1:1:1 (see Figure 4 ), the mixed spectrum effect is shown in Fig.14 , the mixed light source data is shown in Table 2 below:

[0058]

[0059] Its blue light hazard efficiency is K B，V See Fig.15 It can be seen that the blue light hazard efficiency K of the LED structure of the embodiment of the present invention is B，V The blue light hazard efficiency is significantly lower than that of sunlight with the same color temperature of 5700K. B，V , low blue light hazard, meets IEC-62471RGO exemption requirements, and protects eyes more healthily.

[0060] For another example, when the ratio of the first LED light source: the second LED light source: the third LED light source is 1:2:1 (see Figure 4 ), the mixed light source data is shown in Table 3 below:

[0061]

[0062] For another example, when the ratio of the first LED light source: the second LED light source: the third LED light source is 2:2:1 (see Figure 4 ), the mixed light source data is shown in Table 4 below:

[0063]

[0064]

[0065] For another example, when the ratio of the first LED light source: the second LED light source: the third LED light source is 2:1:1 (see Figure 4 ), the mixed light source data is shown in Table 5 below:

[0066]

[0067] Furthermore, the S / P Ratio and M / P ratio values ​​of sunlight with the same color temperature of 5700K are compared as shown in Table 6 below:

[0068] project S / PRatio M / Pratio 5700K sunlight 2.32 1.02

[0069] From the above data, it can be seen that the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention has at least the following beneficial effects:

[0070] 1. The SSI (350-830nm) spectrum similarity of the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention is >78% with the same color temperature 5700K;

[0071] 2. The 3V stepless dimming positive white light LED structure provided in the embodiment of the present invention has Ra>95 and R1-R15>90 after light combination;

[0072] 3. The TLCI-2012 TV lighting index of the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention is >98;

[0073] 4. The GAI-BB relative blackbody trajectory color gamut area index of the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention is >95;

[0074] 5. The TM-30-15 of the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention has Rg>95, Rf>90, Rf,skin>90;

[0075] 6. The S / P Ratio and M / P ratio of the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention are basically the same as the sunlight with the same color temperature, with a healthier rhythm and a clearer field of vision;

[0076] 7. The blue light hazard efficiency K of the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention B，V Lower than the same color temperature of 5700K, low blue light hazard, meets the IEC-62471RGO exemption requirements, and is healthier for eye protection.

[0077] Among them, CCx is the 1931 chromaticity coordinate x, CCy is the 1931 chromaticity coordinate y, CCT is the correlated color temperature, Duv is the distance from the black body with the same color temperature, Φ is the luminous flux, Φe is the optical power, LER is the effective luminous flux efficiency, TLCI-2012 is the television lighting index, Ra is the color rendering index, R1 is the light gray-red color rendering index, R2 is the dark gray-yellow color rendering index, R3 is the saturated yellow-green color rendering index, R4 is the medium yellow-green color rendering index, R5 is the light blue-green color rendering index, R6 is the light blue color rendering index, R7 is the light purple-blue color rendering index, and R8 is the light red-purple color rendering index , R9 is the saturated red color rendering index, R10 is the saturated yellow color rendering index, R11 is the saturated green color rendering index, R12 is the saturated blue color rendering index, R13 is the Caucasian skin color rendering index, R14 is the leaf green color rendering index, R15 is the yellow skin color rendering index, GAI-BB is the color gamut area index of the relatively equal color temperature black body, GAI-E is the color gamut area index of the relatively equal energy white light point, GACRI is the color gamut area of ​​the standard color corresponding to R1-R15, SSI is the spectral similarity, Rg is the saturation, Rf is the color fidelity, and Rf,skin is the fidelity of the skin color.

[0078] Furthermore, the light spectrum stability data of the 3V stepless dimming positive white light LED structure from low current to high current provided by the embodiment of the present invention can also be seen Fig.16 , the test report of spectrum stability and non-deformation is shown in Table 7 below:

[0079]

[0080]

[0081] It can be seen from Table 7 that the color quality parameters of the 3V stepless dimming positive white light LED structure provided by the embodiment of the present invention are stable from low to high current, that is, the spectrum is stable.

[0082] The light efficiency of the LED chip with 3V stepless dimming positive white LED structure provided by the embodiment of the present invention and the prior art solution is shown in Table 8 below:

[0083]

[0084] It can be seen from Table 8 above that the average luminous efficiency of the first LED chip, the second LED chip and the third LED chip in the embodiment of the present invention is 167.07Lm / W, and the luminous efficiency of the existing 3V solution is 147.52Lm / W, which means that the LED structure in the embodiment of the present invention has a luminous efficiency 13.25% higher than that of the existing 5700K 3V solution LED light source.

[0085] In the first fluorescent glue of this embodiment, the mass ratio of glue: green powder with an emission peak wavelength of 530-545nm: red powder with an emission peak wavelength of 650-670nm = 11: (4.2-5.2): (0.28-0.38). For example, the mass ratio of glue: green powder with an emission peak wavelength of 530-545nm: red powder with an emission peak wavelength of 650-670nm can be = 11: 4.2: 0.28 or 11: 5.2: 0.38 or 11: 4.7: 0.33.

[0086] Furthermore, the green powder with an emission peak wavelength of 530-545 nm is composed of Lu3Al5O 12 :Ce 3+ Green powder, half-wave width is 80-120nm; the half-wave width can be 80nm, 90nm, 100nm, 110nm or 120nm. The red powder with an emission peak wavelength of 650-670nm is composed of CaAlSiN3:Eu, with a half-wave width of 80-120nm, and the half-wave width can be 80nm, 90nm, 100nm, 110nm or 120nm.

[0087] See Figure 5 It can be seen that the spectrum of the first LED light source of the LED structure of the embodiment of the present invention, the test data of the first LED light source is shown in the following Table 9:

[0088]

[0089] Among them combined Figure 6 It can be seen that the display index Ra of a single first LED light source is relatively low.

[0090] See further Figure 7 It can be seen that the blue light hazard efficiency K of a single first LED light source is B，V Higher.

[0091] In the second fluorescent glue of this embodiment, the mass ratio of glue: blue-green powder with a peak emission wavelength of 490-500nm: green powder with a peak emission wavelength of 520-540nm: red powder with a peak emission wavelength of 650-670nm = 11: (1.3-2.3): (2.0-3.0): (0.33-0.43). For example, the mass ratio of glue: blue-green powder with a peak emission wavelength of 490-500nm: green powder with a peak emission wavelength of 530-540nm: red powder with a peak emission wavelength of 650-670nm can be 11: 1.3: 2.0: 0.33 or 11: 2.3: 3.0: 0.43 or 11: 1.8: 2.5: 0.38.

[0092] Furthermore, the composition of the blue-green powder with an emission peak wavelength of 490-500 nm is Lu3Al5O 12 :Ce 3+ Green powder, half-wave width is 40-80nm, and the half-width wave can be 40nm, 50nm, 60nm, 70nm or 80nm.

[0093] Furthermore, the green powder with an emission peak wavelength of 530-545 nm is composed of Lu3Al5O 12 :Ce 3+ , the half-wave width is 80-120nm, and the half-wave width can be 80nm, 90nm, 100nm, 110nm or 120nm.

[0094] The red powder with an emission peak wavelength of 650-670nm has a composition of CaAlSiN3:Eu and a half-wave width of 80-120nm, and the half-wave width can be 80nm, 90nm, 100nm, 110nm or 120nm.

[0095] See Figure 8 It can be seen that the spectrum of the second LED light source of the LED structure of the embodiment of the present invention is shown in the following table 10:

[0096]

[0097] Among them combined Fig. 9 It can be seen that the display index Ra of a single second LED light source can reach a higher value. Fig.10 It can be seen that the blue light hazard efficiency K of a single second LED light source is B，V Still higher.

[0098] In the third fluorescent glue of this embodiment, the mass ratio of glue: green powder with an emission peak wavelength of 530-545 nm: red powder with an emission peak wavelength of 650-670 nm = 11: (3.8-4.8): (0.4-0.5). For example, in the third fluorescent glue, the mass ratio of glue: green powder with an emission peak wavelength of 530-545 nm: red powder with an emission peak wavelength of 650-670 nm can be 11: 3.8: 0.4 or 11: 4.8: 0.5 or 11: 4.3: 0.45.

[0099] Furthermore, the green powder with an emission peak wavelength of 530-545 nm is composed of Lu3Al5O 12 :Ce 3+The green powder has a half-wave width of 80-120nm, and the half-wave width can be 80nm, 90nm, 100nm, 110nm or 120nm. The red powder with an emission peak wavelength of 650-670nm is composed of CaAlSiN3:Eu, and has a half-wave width of 80-120nm, and the half-wave width can be 80nm, 90nm, 100nm, 110nm or 120nm.

[0100] See Fig.11 It can be seen that the spectrum of the third LED light source of the LED structure of the embodiment of the present invention, the test data of the third LED light source is shown in the following Table 11:

[0101]

[0102] Among them combined Fig.12 It can be seen that the display index Ra of the single third LED light source is relatively low.

[0103] See further Fig.13 It can be seen that the blue light hazard efficiency K of a single third LED light source is B，V Higher.

[0104] Further, see Fig.17 As can be seen from Table 12 below, the chromaticity coordinates of the LED structure of the embodiment of the present invention fall within a chromaticity ellipse centered at (0.3287, 0.3417) with a major axis a=0.00744, a minor axis of 0.00318, and an inclination angle of 60.37°, reflecting the light color concentration and color consistency of the product.

[0105]

[0106] In summary, the first LED light source, the second LED light source and the third LED light source arranged in combination in the embodiment of the present invention can achieve a higher color rendering index and lower blue light hazard. More importantly, Fig.16 It can be seen that the combined light spectrum from low current to high current is very stable, which is very similar to the LED light source of the prior art (see Figure 2 ) forms a significant difference in the stability of the combined light spectrum from low current to high current.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A 3V stepless dimming positive white light LED structure, characterized in that: It includes a first LED light source, a second LED light source and a third LED light source connected in series, in parallel or in series and in parallel; The first LED light source includes a first LED chip and a first fluorescent glue encapsulating the first LED chip, the main wavelength of the first LED chip is 440-445nm, and the first fluorescent glue includes a mixture of glue, green powder with an emission peak wavelength of 530-545nm, and red powder with an emission peak wavelength of 650-670nm; The second LED light source includes a second LED chip and a second fluorescent glue encapsulating the second LED chip, the main wavelength of the second LED chip is 450-455nm, and the second fluorescent glue includes glue, blue-green powder with an emission peak wavelength of 490-500nm, green powder with an emission peak wavelength of 530-545nm, and red powder with an emission peak wavelength of 650-670nm; The third LED light source includes a third LED chip and a third fluorescent glue encapsulating the third LED chip. The main wavelength of the third LED chip is 460-470nm. The third fluorescent glue includes a mixture of glue, green powder with an emission peak wavelength of 530-545nm, and red powder with an emission peak wavelength of 650-670nm.

2. The 3V stepless dimming positive white light LED structure according to claim 1, characterized in that: The number ratio of the first LED light source: the second LED light source: the third LED light source=1:(1-2):(1-2).

3. The 3V stepless dimming positive white light LED structure according to claim 1, characterized in that: In the first fluorescent glue, the mass ratio of glue: green powder with an emission peak wavelength of 530-545 nm: red powder with an emission peak wavelength of 650-670 nm is 11: (4.2-5.2): (0.28-0.38).

4. The 3V stepless dimming positive white light LED structure according to claim 1, characterized in that: In the second fluorescent glue, the mass ratio of glue: blue-green powder with emission peak wavelength of 490-500nm: green powder with emission peak wavelength of 530-540nm: red powder with emission peak wavelength of 650-670nm = 11: (1.3-2.3): (2.0-3.0): (0.33-0.43).

5. The 3V stepless dimming positive white light LED structure according to claim 1, characterized in that: In the third fluorescent glue, the mass ratio of glue: green powder with an emission peak wavelength of 530-545 nm: red powder with an emission peak wavelength of 650-670 nm is 11: (3.8-4.8): (0.4-0.5).

6. The 3V stepless dimming positive white light LED structure according to claim 1, characterized in that: The green powder with an emission peak wavelength of 530-545 nm is composed of Lu3Al5O 12 :Ce 3+ , half-wave width is 80-120nm; the emission peak wavelength is 650-670nm, the composition of the red powder is CaAlSiN3:Eu, and the half-wave width is 80-120nm.

7. The 3V stepless dimming positive white light LED structure according to claim 1, characterized in that: The composition of the blue-green powder with an emission peak wavelength of 490-500nm is Lu3Al5O 12 :Ce 3+ , half-wave width is 40-80nm; the composition of the green powder with an emission peak wavelength of 530-545nm is Lu3Al5O 12 :Ce 3+ , half-wave width is 80-120nm; the red powder with an emission peak wavelength of 650-670nm is composed of CaAlSiN3:Eu, and the half-wave width is 80-120nm.

8. The 3V stepless dimming positive white light LED structure according to claim 1, characterized in that: The green powder with an emission peak wavelength of 530-545 nm is composed of Lu3Al5O 12 :Ce 3+ , half-wave width is 80-120nm; the red powder with an emission peak wavelength of 650-670nm is composed of CaAlSiN3:Eu, and the half-wave width is 80-120nm.

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