TWI440843B - Method for detecting mixed color temperature of phosphors and system using thereof - Google Patents

Description

Fluorescent powder mixed light color temperature detecting method and system thereof

The invention relates to a fluorescent powder mixed light color temperature detecting method and a system thereof, which can prepare a predetermined color temperature and color rendering property before the light emitting diode package is prepared to shorten the color temperature detecting time of the light emitting diode. And improve the process waste problem.

In recent years, light-emitting diodes (LEDs) have been widely used in various light-emitting devices because of their high luminous efficiency, low power consumption, long service life, and small component size, and have replaced several types of lighting devices.

However, LEDs are difficult to apply to the people's livelihood lighting market. In addition to the problems of heat dissipation, insufficient brightness, and diminishing brightness, the LEDs have the problem of not directly stimulating white light. At present, a white light LED can be obtained by adjusting the mixing ratio of the fluorescent materials in the package structure of the LED by a light mixing mechanism.

At present, the mixed color temperature of the detection LED is performed after the LED package. First, an appropriate proportion of one or more types of phosphor powder is taken according to a predetermined color temperature scale. Next, the phosphor powder is added to the A glue (for example, a silicone resin or an epoxy resin) and stirred to uniformly disperse the phosphor powder in the A gel. Then, the A glue dispersing the phosphor powder is mixed with the B glue (curing agent), and the colloid 102 in which the phosphor powder is dispersed is covered on the LED chip 101 by a dispenser, and dried and packaged to obtain a process. A light emitting diode 10 is shown in FIG.

In order to detect whether the LED has a predetermined color temperature, the produced light-emitting diode 10 can be detected by a color temperature detecting unit (for example, a spectroscopic spectrometer). As shown in FIG. 1, the first monochromatic light excited by the electrically driven LED chip 101 collides with the phosphor powder in the colloid 102 to release the second monochromatic light, and the second monochromatic light and the first single light When the color light is mixed, it will be released from the surface of the phosphor powder to obtain a mixed light. Then, the spectroscopic spectrometer 11 receives the mixed light, and after analyzing by the operation unit 12, the black body radiation color temperature of the mixed light and the relative position on the color coordinates are obtained, and the mixed light color temperature of the mixed light is displayed on the display unit 13. Thereby, it can be known whether the phosphor powder mixed in this ratio can reach the desired color temperature.

If the mixed color temperature of the mixed light is not the expected color temperature, the concentration and mixing ratio of the fluorescent powder must be re-adjusted, and then the mixing, agitation, drying, and encapsulation processes are performed to obtain another light-emitting diode. Then, the color mixing property of the phosphor powder is measured again by the color temperature detecting unit, and converted to a color coordinate. By repeating the above process to adjust the color temperature, a light-emitting diode having a desired color temperature can be produced.

Although a light-emitting diode having a desired color temperature can be produced in the above manner, this method still has its disadvantages. First, the phosphor powder is unevenly mixed; secondly, the color temperature and the color rendering index are not easy to adjust; thirdly, the color temperature detection of the mixed light can be performed after the LED package is packaged, resulting in a long verification time; If the obtained light-emitting diode does not reach the desired color temperature, the light-emitting diode needs to be discarded and re-made, resulting in problems such as low yield of the light-emitting diode, serious waste problem, and excessive consumption of the fluorescent powder.

Therefore, there is an urgent need to develop a fluorescent powder mixed color temperature detecting method and a system using the same method to complete the detection of the mixed color temperature before the light emitting diode package. In this way, optical properties can be measured without waiting for the LED package to be completed, which can shorten the verification time, improve the yield of the LED, reduce waste generation, and reduce the amount of phosphor powder.

The main object of the present invention is to provide a method for detecting a mixed color temperature of a fluorescent powder, which can be prepared to produce a mixed fluorescent powder having a predetermined color temperature before being packaged by the light emitting diode.

Another object of the present invention is to provide a fluorescent powder mixed color temperature detecting system, which can detect the mixed color temperature of the fluorescent powder solution, and adjust the mixing ratio of the fluorescent powder solution to shorten the color temperature verification time of the LED. .

In order to achieve the above object, the present invention provides a method for detecting a color mixing temperature of a phosphor powder, comprising the steps of: (A) dispersing a first phosphor powder group in a solvent to obtain a phosphor powder solution; (B) Putting the phosphor powder solution above a light-emitting device, so that the light emitted by the light-emitting body passes through the phosphor powder solution; (C) detecting the light passing through the phosphor powder solution by a color temperature detecting unit to output a signal; and (D) The signal is converted to a relative position on the color coordinates to obtain a mixed color temperature of the phosphor powder solution.

The method for detecting the mixed color temperature of the fluorescent powder of the invention is characterized in that the fluorescent powder can be uniformly dispersed in the solvent, and the fluorescent powder solution can be directly directed to the light-emitting path of the light-emitting device to measure the fluorescent powder solution. Mixed light color temperature. Compared with the prior art, it is necessary to complete the light-emitting diode package to detect the mixed color temperature. The detection method of the invention can detect the color mixing temperature of the fluorescent powder before the light-emitting diode is formed to avoid the waste of the fluorescent powder and the LED. Waste is produced.

In the fluorescent powder mixed color temperature detecting method of the present invention, after the step (D), the method further comprises: (E) adding a second phosphor powder group to the phosphor powder if the obtained mixed color temperature is not a predetermined color temperature. And (F) repeating steps (C) and (D). Alternatively, the step (C) of the method for detecting the mixed color temperature of the phosphor powder of the present invention may also be the step (C'): detecting the light passing through the phosphor powder solution by a color temperature detecting unit to output a signal; and if obtained When the mixed color temperature is not a predetermined color temperature, a second phosphor powder group is added to the phosphor powder solution. Therefore, the fluorescent powder mixed color temperature detecting method of the present invention can synchronously adjust the proportion and concentration of the fluorescent powder in the fluorescent powder solution while detecting the color temperature.

In addition, in the fluorescent powder mixed color temperature detecting method of the present invention, the phosphor powder composition of the first phosphor powder group and the second phosphor powder group may be the same or different. Meanwhile, the first phosphor powder group and the second phosphor powder group respectively contain one or more kinds of phosphor powders having different light emission wavelengths. Further, the first phosphor powder group and the second phosphor powder group preferably contain a phosphor powder having a particle diameter of between 10 nm and 7 μm, and more preferably between 20 nm and 3 μm.

Furthermore, in the method for detecting the color mixing temperature of the phosphor powder of the present invention, the solvent is preferably selected from the group consisting of a silicone resin, an epoxy resin, water, ethanol, propanol, and a mixture thereof. In addition, the color temperature detecting unit is preferably a spectroscopic spectrometer; the light emitting device is preferably a light emitting diode, and more preferably a blue light emitting diode or an ultraviolet light emitting diode.

In another aspect, the present invention further provides a fluorescent powder mixed color temperature detecting system using the above-mentioned fluorescent powder mixed color temperature detecting method, comprising: at least one fluorescent powder supply unit, each of the fluorescent powder supply unit systems a phosphor powder group; a light-emitting device; a color temperature detecting unit corresponding to the light-emitting path of the light-emitting device; a detecting groove disposed on the light-emitting path of the light-emitting device and located between the light-emitting device and the color temperature detecting unit; The arithmetic unit is connected to the color temperature detecting unit; and a display unit is connected to the arithmetic unit. The light emitted by the light-emitting device is incident on the color temperature detecting unit through the detecting slot, and the computing unit receives one of the signals output by the color temperature detecting unit, and converts the signal into a relative position on the color coordinate, and outputs the display to the display. The unit displays a mixed color temperature; and when the mixed color temperature is not a predetermined color temperature, the phosphor supply unit adds the phosphor group to the detection tank.

The fluorescent powder mixed light color temperature detecting system of the invention can adjust the proportion and concentration of the fluorescent powder in the fluorescent powder solution while the mixed color temperature does not reach the expected color temperature, thereby obtaining a fluorescent powder mixed solution having a predetermined color temperature. The fluorescent powder mixed color temperature detecting system of the invention can complete the detection of the color temperature of the mixed light while preparing the mixed solution of the fluorescent powder, and can also adjust the concentration and proportion of the mixed solution of the fluorescent powder at the same time, so the color temperature and the display are obvious The adjustment of the color index is convenient, and the process time and production cost can be saved.

The fluorescent powder mixed light color temperature detecting system of the present invention may further include a pump connected to the fluorescent powder supply unit; and preferably, the pumping system is connected to the arithmetic unit, and the arithmetic unit drives the pump to The phosphor powder group accommodated in the phosphor supply unit is added to the detection tank. In this way, the proportion and concentration of the phosphor powder placed in the detection tank can be automatically adjusted.

In addition, the phosphor powder mixed color temperature detecting system of the present invention may further include a power supply unit electrically connected to the light emitting device.

Meanwhile, in the phosphor powder mixed color temperature detecting system of the present invention, the light emitting device is preferably a light emitting diode, and more preferably a blue light emitting diode or an ultraviolet light emitting diode. In addition, the color temperature detecting unit may be a commonly used device for detecting color temperature, and is preferably a spectroscopic spectrometer.

Furthermore, in the phosphor powder mixed color temperature detecting system of the present invention, each of the phosphor powder supply units accommodates phosphor powders having different light emitting wavelengths. Therefore, the arithmetic unit can drive the pump to add the phosphor powder in the different phosphor supply unit to the detection tank. At the same time, the particle size of the phosphor powder contained in the phosphor powder supply unit is preferably between 10 nm and 7 μm, more preferably between 20 nm and 3 μm.

Therefore, the method and system for detecting the mixed color temperature of the phosphor powder of the present invention can complete the color temperature detection before the LED package, thereby shortening the verification time of the LED, reducing the amount of the phosphor powder, and avoiding the generation of LED waste. And improve the efficiency of the light-emitting diode and other effects.

2 is a schematic view of the phosphor powder mixed color temperature detecting system of the embodiment. The phosphor powder mixed color temperature detecting system of the embodiment includes at least one phosphor powder supply unit 21, a light emitting device 22, a color temperature detecting unit 23, a detecting tank 24, an arithmetic unit 25, and a display unit 26. . Each of the phosphor powder supply units 21 accommodates a phosphor powder group; the color temperature detecting unit 23 corresponds to the light emitting path of the light emitting device 22; the detecting slot 24 is disposed on the light emitting path of the light emitting device 22, and is located in the light emitting device. The device 22 and the color temperature detecting unit 23 are connected; the arithmetic unit 25 is connected to the color temperature detecting unit 23; and the display unit 26 is connected to the arithmetic unit 25.

The detecting tank 24 is for accommodating a phosphor powder solution. When the light emitted by the illuminating device 22 passes through the detecting slot 24 and enters the color temperature detecting unit 23, the computing unit 25 receives a signal output by the color temperature detecting unit 23, and converts the signal into a relative position on the color coordinate. And outputting to the display unit 26 to display a mixed color temperature; and when the mixed color temperature is not the predetermined color temperature, the phosphor supply unit 21 adds the phoenix powder group it accommodates to the detection slot 24 to adjust the fluorescence. The proportion and concentration of phosphor powder in the powder solution.

In addition, the phosphor powder mixed color temperature detecting system of the present embodiment further includes a pump 27 connected to the phosphor powder supply unit 21, and the pump 27 is further connected to the arithmetic unit 25. When the mixed color temperature is not the predetermined color temperature, the arithmetic unit 25 drives the pump 27 to add the phosphor group accommodated in the phosphor supply unit 21 to the detection tank 24. Thereby, the proportion and concentration of the phosphor powder in the phosphor powder solution can be automatically adjusted.

Here, the color temperature detecting unit 23 is a spectroscopic spectrometer, and the light emitting device 22 can be a light emitting diode of various colors, such as a blue light emitting diode or an ultraviolet light emitting diode. If a blue light emitting diode is used, white light can be mixed with YAG yellow fluorescent powder. If the UV light-emitting diode is used, it can be mixed with red, green and blue phosphors to mix white light. In the present embodiment, an ultraviolet light emitting diode is used.

In addition, the phosphor powder mixed color temperature detecting system of the present embodiment is provided with four phosphor powder supply units 21, and each of the phosphor powder supply units 21 accommodates phosphor powders having different light emitting wavelengths. For example: YAG, Y ₂ O ₃ doped with transition elements (such as: Er ³⁺ , Yb ³⁺ , Ce ³⁺ ), or CdSe/ZnS quantum dots, and the like. In order to allow the phosphor powder to exhibit a Brownian motion state in the phosphor powder mixed solution, the particle size of the phosphor powder may be between 10 nm and 7 μm. In the present embodiment, the particle diameters of the various phosphor powders are between 20 nm and 3 μm.

Furthermore, the phosphor powder mixing solution in the detecting tank 24 of the present embodiment may be a solvent of silicone, epoxy, water, ethanol, propanol, or a mixture thereof. In the present embodiment, in order to facilitate the packaging of the light-emitting diode in the future, the solvent used for the phosphor powder mixing solution is a silicone resin.

In addition, the phosphor powder mixed color temperature detecting system of the embodiment further includes a power supply unit 28 electrically connected to the light emitting device 22. At the same time, the illuminating device 22 can be disposed in a platform 29 having a light-transmitting window 291, so that the detecting slot 24 can be placed on the platform 29 and corresponding to the light-transmitting window 291 to facilitate the mixed color temperature of the phosphor powder mixing solution. Detection.

The operation of the phosphor powder mixed color temperature detecting system of this embodiment is as follows. First, in the detecting tank 24, the first phosphor powder group is dispersed in a silicone resin at a theoretical ratio to obtain a phosphor powder solution. In the present embodiment, three kinds of phosphor powders which are excited by ultraviolet light to emit red, green and blue colors are selected, and it is expected that the light of the phosphors of the three colors can be mixed to obtain white light.

Next, the detection tank 24 in which the phosphor powder solution is placed is placed above the light-emitting device 22, and the power supply unit 28 drives the light-emitting device 22 to cause the first monochromatic light emitted by the light-emitting device 22. This first monochromatic light system passes through the detection tank 24 in which the phosphor powder solution is accommodated, and strikes the phosphor powder. Since the phosphor powder solution contains several kinds of phosphor powders of different emission wavelengths, when the phosphor powder is struck by the first monochromatic light, different kinds of phosphor powders will excite the second monochromatic light of different wavelengths. And a mixed light is obtained by a light mixing mechanism. Then, the input port 231 of the color temperature detecting unit 23 receives the mixed light, and outputs a signal to the output port 232 of the color temperature detecting unit 23. Finally, the arithmetic unit 25 receives the signal and converts the signal into a relative position on the color coordinates, and displays the mixed color temperature of the phosphor powder solution on the display unit 26.

If the measured color temperature of the phosphor powder solution is not a predetermined color temperature, the arithmetic unit 25 drives the pump 27, and supplies the phosphor powder to the unit by a fine adjustment of the second phosphor group by the pump 27. The phosphor powder group in 21 is added to the phosphor powder mixed solution in the detection tank 24. The calculation unit 25 adjusts the proportion and content of the second phosphor powder group added to the phosphor powder mixing solution according to the color temperature of the mixed light obtained last time to adjust the concentration of the phosphor powder mixed solution and the proportion of the phosphor powder. Then, the light passing through the phosphor powder mixing solution is collected by the color temperature detecting unit 23, and the signal outputted by the color temperature detecting unit 23 is converted into a relative position on the color coordinate, thereby obtaining the mixed color temperature of the adjusted fluorescent powder solution. . By continuously fine-tuning the concentration and ratio of the phosphor powder mixed solution, a phosphor powder mixed solution having a predetermined color temperature can be obtained.

After the phosphor powder mixed solution having a predetermined color temperature is prepared, the package can be packaged according to a general light emitting diode packaging process. In the present embodiment, the phosphor powder is dispersed in the solvent of the epoxy resin, and then the phosphor powder mixed solution is mixed with the curing agent, and the gel dispenser 202 is coated on the LED wafer 201 by the dispenser. On the top, through the drying and packaging process, a light-emitting diode 20 can be obtained, as shown in FIG. The LED chip 201 of the light-emitting diode 20 is preferably the same as the light-emitting device used in the fluorescent powder mixed color temperature detecting system to ensure that the color temperature of the produced light-emitting diode 20 is a predetermined color temperature.

Referring to FIG. 3, when the LED chip 201 is electrically driven, the first monochromatic light excited by the LED chip 201 will strike the phosphor powder in the colloid 102. Since the colloid 102 contains several kinds of phosphor powders which can emit different light-emitting wavelengths, when the phosphor powder is struck by the first monochromatic light, different colors of the emitted light can be emitted. After the light mixing mechanism of the various colors of light, a mixed light having a predetermined color temperature is obtained.

The method and method for detecting the mixed color temperature of the phosphor powder of the invention can reduce the generation of waste LED and shorten the verification time of the LED by first completing the mixed color temperature detection of the mixed phosphor powder and then performing LED packaging . In addition, while the fluorescent powder mixed light color temperature is detected, the concentration and proportion of the fluorescent powder are adjusted to obtain a fluorescent powder mixed solution of a predetermined color temperature. In this way, in addition to easy adjustment of the color temperature and color rendering index of the LED, and the amount of phosphor powder can be reduced to avoid the waste of phosphor powder. Furthermore, the phosphor powder used in the method for detecting the mixed color temperature of the phosphor powder of the present invention and the method thereof are preferably nano-sized phosphor powder particles, so that the phosphor powder can be uniformly dispersed in the solvent, and the mixed phosphor can be mixed. The light mixture is evenly mixed.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of the claims is intended to be limited to the above embodiments.

10,20. . . Light-emitting diode

101,201. . . LED chip

102,202. . . colloid

11. . . Spectrometer

12. . . Arithmetic unit

twenty one. . . Fluorescent powder supply unit

twenty two. . . Illuminating device

twenty three. . . Color temperature detection unit

231. . . Input port

232. . . Output port

twenty four. . . Detection slot

25. . . Arithmetic unit

26. . . Display unit

27. . . Pump

28. . . Power supply unit

29. . . platform

291. . . Light transmission window

FIG. 1 is a schematic diagram of a conventional light-emitting diode color temperature detecting system.

2 is a schematic diagram of a fluorescent powder mixed light color temperature detecting system according to a preferred embodiment of the present invention.

3 is a schematic view of an LED according to a preferred embodiment of the present invention.

twenty one. . . Fluorescent powder supply unit

twenty two. . . Illuminating device

twenty three. . . Color temperature detection unit

231. . . Input port

232. . . Output port

twenty four. . . Detection slot

25. . . Arithmetic unit

26. . . Display unit

27. . . Pump

28. . . Power supply unit

29. . . platform

291. . . Light transmission window

Claims (18)

A method for detecting a color mixing temperature of a phosphor powder comprises: (A) dispersing a first phosphor powder group in a solvent to obtain a phosphor powder solution, wherein the solvent is selected from the group consisting of a silicone resin, an epoxy resin, and a water. a group consisting of ethanol, propanol, and a mixture thereof; (B) placing the phosphor powder solution above a light-emitting device such that light emitted by the light-emitting body passes through the phosphor powder solution; (C) The color temperature detecting unit detects the light passing through the phosphor powder solution to output a signal; (D) converts the signal into a relative position on the color coordinates to obtain a mixed color temperature of the phosphor powder solution; (E) The obtained mixed color temperature is not a predetermined color temperature, a second phosphor powder group is added to the phosphor powder solution; and (F) steps (C) and (D) are repeated. The detection method of claim 1, wherein the first phosphor powder group and the second phosphor powder group have the same phosphor composition. The detection method of claim 1, wherein the first phosphor powder group and the second phosphor powder group have different phosphor powder compositions. The detection method according to claim 1, wherein the first phosphor powder has a phosphor powder particle size of between 10 nm and 7 μm. The method of detecting according to claim 1, wherein the phosphor powder of the second phosphor group has a particle size of between 10 nm and 7 μm. The detection method according to claim 1, wherein the color temperature detecting unit is a spectroscopic spectrometer. The detecting method according to claim 1, wherein the light emitting device is a light emitting diode. The detection method of claim 7, wherein the light emitting diode system is a blue light emitting diode or an ultraviolet light emitting diode. A phosphor powder mixed color temperature detecting system comprises: at least one phosphor powder supply unit, each of the phosphor powder supply units is provided with a phosphor powder group; a light emitting device; a color temperature detecting unit corresponding to the a illuminating path of the illuminating device; a detecting slot is disposed on the illuminating path of the illuminating device and located between the illuminating device and the color temperature detecting unit, wherein the detecting slot is for accommodating a phosphor powder solution The light powder solution is formed by dispersing the phosphor powder group in a solvent; an arithmetic unit is connected to the color temperature detecting unit; and a display unit is connected to the arithmetic unit; wherein the light emitting device emits The light passes through the detection slot and is incident on the color temperature detecting unit. The computing unit receives a signal output by the color temperature detecting unit, converts the signal into a relative position on the color coordinate, and outputs the signal to the display unit. Up to display a mixed color temperature; and when the mixed color temperature is not a predetermined color temperature, the phosphor supply unit adds the phosphor group to the detecting tank to adjust the fluorescent powder solution The proportion and concentration of phosphor. The detection system of claim 9, further comprising a pump connected to the phosphor supply unit. The detection system of claim 10, wherein the pump is further connected to the operation unit, the operation unit drives the pump to add the phosphor group accommodated in the phosphor supply unit. To the detection tank. The detection system of claim 9, further comprising a power supply unit electrically connected to the illumination device. The detection system of claim 9, wherein each of the phosphor supply units respectively accommodates phosphor powder having different emission wavelengths. The detection system of claim 9, wherein the phosphor powder has a phosphor particle size of between 10 nm and 7 μm. The detection system of claim 9, wherein the phosphor powder has a phosphor particle size of between 20 nm and 3 μm. The detection system of claim 9, wherein the color temperature detecting unit is a spectroscopic spectrometer. The detection system of claim 9, wherein the illumination device is a light emitting diode. The detection system of claim 17, wherein the light emitting diode system is a blue light emitting diode or an ultraviolet light emitting diode.