TW201528558A - Pretest for phosphor gel and LED packaging method using the same - Google Patents

Abstract

Pretest for a phosphor gel and a LED packaging method using the same are provided. The pretest for the phosphor gel comprises a gel-providing step, a weight test step, and a chromaticity test step. At the gel-providing step, a phosphor gel comprising phosphor particles and an encapsulation gel is provided. The weight test step is conducted to test if the weight of the phosphor gel belongs to a predetermined weight range. The chromaticity test step is conducted to test if the chromaticity of the phosphor gel belongs to a predetermined chromaticity range.

Description

Fluorescent colloid pre-detection method and application method thereof

The invention relates to a fluorescent colloid pre-detecting method and a light-emitting diode packaging method using the same.

Generally, in the LED package method, after the LED chip is placed on the lead frame, a phosphor colloid is provided thereon. The phosphor particles in the phosphor colloid can be excited by the light emitted by the light-emitting diode wafer, and emit different light depending on the type of the phosphor powder particles. Thereby, the packaged light emitting diode element can emit light having different color temperatures, brightness, color, and the like.

In a method for providing a fluorescent colloid, firstly, the encapsulating colloid is mixed with the phosphor powder particles and stirred uniformly, and then the liquid fluorescent colloid is heated and solidified by air pressure or by a glue needle. . However, this method is not easy to control the amount of dispensing, and the problem of uneven distribution of the phosphor powder particles is liable to occur, resulting in inconsistencies between the phosphor colloids of the respective LED components, thereby causing the respective LED components. The difference in the emitted light. Moreover, the capacity of this method is low. If it is artificially adjusted, it is more likely to cause errors and cause losses.

In another method of providing a fluorescent colloid, the encapsulant and the firefly are After the light powder particles are mixed and stirred uniformly, the fluorescent colloid is supplied to the lead frame by a molding machine, and the fluorescent colloid is cured. However, there is also a problem that the phosphor powder particles are unevenly distributed, resulting in inconsistencies between the phosphor colloids, which in turn causes a difference in light emitted from the light-emitting diode elements. If it is artificially adjusted, it is equally prone to errors and losses.

The invention provides a fluorescent colloid pre-detection method and a light-emitting diode packaging method using the same. A pre-test of the phosphor colloid is performed before the phosphor colloid is supplied to the lead frame provided with the light-emitting diode wafer. Moreover, only the phosphor colloid which meets the predetermined standard after the pre-inspection is confirmed is supplied to the lead frame, thereby improving the consistency between the phosphor colloids of the respective LED components.

According to some embodiments of the invention, the fluorescent colloid pre-test method includes providing a colloid step, a weight detecting step, and a chroma detecting step. In the step of providing a colloid, a phosphor colloid comprising a plurality of phosphor particles and an encapsulant is provided. The weight detecting step is for detecting whether the weight of the fluorescent colloid conforms to a predetermined weight range. The chromaticity detecting step is for detecting whether the chromaticity of the fluorescent colloid conforms to a predetermined chromaticity range.

In accordance with some embodiments of the present invention, a method of packaging a light emitting diode includes providing a plurality of phosphor colloids that have been pre-tested by a fluorescent colloid pre-test method as described above, conform to a predetermined standard, and subjected to a packaging step. The packaging step includes providing a tape having a plurality of lead frames and providing a phosphor colleant that meets predetermined criteria to the lead frame.

In order to better understand the above and other aspects of the present invention, the following The preferred embodiment is described in detail with reference to the accompanying drawings, as follows:

100‧‧‧Lighting diode package method

S110, S112~S118, S120, S130‧‧‧ steps

210‧‧‧Flame powder particles

220‧‧‧Package colloid

230‧‧‧Fluorescent colloid

300‧‧‧Lighting diode components

310‧‧‧ lead frame

320‧‧‧Material

330‧‧‧Glue dispenser

E‧‧‧Light Diode Wafer

1 is a flow chart of a method of packaging a light emitting diode according to an embodiment of the present invention, and a method of pre-detecting a phosphor colloid according to an embodiment of the present invention.

Figure 2 is a schematic illustration of a phosphor colloid in accordance with an embodiment of the present invention.

3A-3D are schematic views showing part of the steps of a method of packaging a light emitting diode according to an embodiment of the invention.

Please refer to FIG. 1 , which illustrates a flow of a method for packaging a light emitting diode according to an embodiment of the present invention, and a flow of a method for pre-detecting a fluorescent colloid (S110) according to an embodiment of the present invention. . The LED package method 100 includes a step S110 of providing a plurality of phosphor colloids subjected to pre-detection by a fluorescent colloid pre-detection method, meeting a predetermined standard, a step S120 of performing encapsulation, and a step S130 of performing curing.

In step S110, a fluorescent colloid pre-test is first performed. The fluorescent colloid pre-detection method includes a step S112 of providing a colloid, a step S114 of weight detection, and a step S116 of chromaticity detection.

Referring to FIG. 2, in a colloid step S112, a phosphor colloid 230 including a plurality of phosphor particles 210 and an encapsulant 220 is provided. For example, the phosphor particles 210 and the encapsulant 220 are mixed to form a phosphor colloid 230, and the phosphor colloid 230 is provided. In some embodiments, the phosphor particles 210 may comprise silicate or Yttrium Aluminum Garnet. YAG) and so on. In some embodiments, the encapsulant 220 may comprise silicone or a resin, and in particular, a resin may be employed as the encapsulant 220. In some embodiments, the phosphor colloid 230 can include two or more phosphor particles 210, such as two phosphor particles 210 having different colors. In some embodiments, in addition to the phosphor particles 210 and the encapsulant 220, the phosphor colloid 230 can include other additives, such as the addition of titanium oxide particles to increase the uniformity of illumination. In some embodiments, the phosphor colloid 230 can be spherical.

Please return to Figure 1. The weight detecting step S114 is for detecting whether the weight of the fluorescent colloid 230 conforms to a predetermined weight range. In some embodiments, only the phosphor colloid 230 having a weight that meets the predetermined weight range will be followed by a chroma detection step S116. Thereby, the required number of chroma detections can be reduced, the rate of fluorescent colloid pre-inspection can be increased, and the cost of fluorescent colloid pre-inspection can be reduced. Of course, it is also possible to perform the weight detecting step S114 and the chromaticity detecting step S116 for all of the fluorescent colloids 230.

The chromaticity detecting step S116 is for detecting whether the chromaticity of the fluorescent colloid 230 conforms to a predetermined chromaticity range. In particular, this predetermined range of chromaticities may include a range definition for color, color temperature, color rendering, and the like. In some embodiments, the predetermined chromaticity range can be defined by the CIE color space. For example, if the predetermined range is defined by the color temperature 3000K, the predetermined chromaticity range does not exceed 0.0025 (ie, ≦0.0025) in the range of the X-axis and/or the Y-axis of the CIE color space. In some embodiments, the predetermined chromaticity range may include a plurality of sub-intervals for grading the phosphor colloid 230 subjected to the chromaticity detecting step S116 to different levels of the fluorescent colloid 230 (eg, phosphor colloids having different chromaticities) 230) can be used for different light emitting diode elements.

In particular, in some embodiments, the chrominance detection step S116 The fluorescent colloid excitation step and the chromaticity range determination step are included. In the fluorescent colloid excitation step, the fluorescent colloid 230 is irradiated with the initial light. The phosphor colloid excitation step is to excite the phosphor particles 210 to cause the phosphor particles 210 to be excited to emit an excitation light. The excitation light has a chromaticity which will be judged in the subsequent chromaticity range determination step. In some embodiments, which initial light, such as blue or ultraviolet light, is used may be determined based on the type of phosphor particle 210. For example, in the example using yttrium aluminum garnet phosphor particles 210, the initial light may be blue light. In the chromaticity range judging step, the value of the chromaticity of the excitation light is measured, and it is judged whether or not the chromaticity of the excitation light of the fluorescent colloid 230 falls within a predetermined chromaticity range. In particular, in some embodiments, it is determined whether the spectrally converted chromaticity of the excitation light falls within a predetermined chromaticity range. In some embodiments, the predetermined chromaticity range may include a plurality of subintervals, and in the judging step of the chromaticity range, it may be further determined whether the chromaticity of the fluorescent colloid 230 falls within the subintervals to be ranked. Fluorescent colloid 230.

In some embodiments, as in the example of Fig. 1, the weight detecting step S114 is performed first, and the chromaticity detecting step S116 is performed. Also, in some embodiments, in the chromaticity detecting step S116, only the phosphor colloid 230 having a weight conforming to a predetermined weight range is detected. However, in other embodiments, the chromaticity detecting step S116 may be performed first, and the weight detecting step S114 may be performed. Also, in some embodiments, in the weight detecting step S114, only the phosphor colloid 230 having a chromaticity conforming to a predetermined chromaticity range is detected.

In some embodiments, the fluorescent colloid pre-test method may further include a step S118 of recycling. The recycling step S118 includes collecting a collecting step of the fluorescent colloid 230 whose weight does not meet the predetermined weight range and/or the chromaticity does not satisfy the predetermined chromaticity range, and the phosphor particles 210 and the encapsulating colloid of the fluorescent colloid 230 collected by the collecting step. Separation step of separation of 220, and phosphor powder obtained by recycling separation step Granule 210. In some embodiments, the separating step can remove the encapsulant 220 by burning or using a chemical solvent to obtain phosphor particles 210. In some embodiments, the recycling step can further include using the recovered phosphor particles 210 for providing a colloidal step S112. These recovered phosphor particles 210 can be used to form a new phosphor colloid 230, thereby saving raw material costs.

In the example of Fig. 1, the fluorescent colloid pre-test method includes weight detection and chromaticity detection. However, depending on the needs of the manufacturer, the fluorescent colloid pre-test method can include further testing of other properties of the phosphor colloid 230, such as transparency and the like.

After the completion of the fluorescent colloid pre-test, step S110 further includes providing a plurality of fluorescent colloids 230 conforming to a predetermined standard through a pre-inspection of the fluorescent colloid pre-detection method according to any of the preceding embodiments or examples, for Steps of encapsulating step S120, curing step S130, and the like.

In some embodiments, at the packaging step S120, a tape 320 having a plurality of lead frames 310 is first provided, as shown in FIG. 3A. At this time, a plurality of fluorescent colloids 230 conforming to predetermined standards may be placed on a glue dispenser 330. In some embodiments, the phosphor colloid 230 is spherical. Although not shown in FIG. 3A, the lead frame 310 may be provided with a light-emitting diode chip E (shown in FIG. 3D), and the light-emitting diode chip E is electrically connected to the light-emitting diode chip in advance. On the lead frame 310.

Next, the phosphor colloids 230 meeting the predetermined standards are respectively supplied to the lead frame 310 by using the glue dispenser 330, as shown in FIG. 3B. Since the phosphor colloid 230 has been pre-tested, all of the phosphor colloids 230 provided to the lead frame 310 conform to predetermined standards, and therefore, the lead frames 310 on the same strip 320 are The phosphor colloids 230 contained in the openings are not significantly different from each other. Here, the fluorescent colloid 230 is, for example, spherical.

As shown in FIG. 3C, after the fluorescent colloid 230 conforming to the predetermined standard is supplied onto the lead frame 310, the fluorescent colloid 230 is pressurized and heated. At the beginning of the pressurized heating, the phosphor colloid 230 is slightly fluid due to heat and fills the opening of the lead frame 310. As the temperature and/or pressure rises, the curing step S130 is entered, and the phosphor colloid 230 meeting the predetermined standard is cured.

Thereafter, the LED package method 100 may further include, for example, cutting, providing a secondary lens, etc. to obtain the LED component 300 as shown in FIG. 3D (the portion of FIG. 3D omitting the LED component 300) element). Since the phosphor colloids 230 obtained from the same tape 320 have little difference from each other due to the pre-examination of the phosphor colloid, these LED components 300 are more uniform.

In summary, via the fluorescent colloid pre-test method according to an embodiment of the present invention, the phosphor colloid can be first tested before being provided on the lead frame to evaluate its suitability. Moreover, in the light-emitting diode packaging method according to the embodiment of the present invention, only the fluorescent colloid having the pre-test result that meets the predetermined standard is provided on the lead frame, and thus the finally obtained light-emitting diode element has a difference. Large fluorescent colloids are therefore more consistent. Specifically, taking the CIE color space to define the chromaticity of the light-emitting diode element as an example, on the X-axis of the CIE color space, the chromaticity test distribution value of a certain amount of the light-emitting diode element is typically about 0.015. However, if a fluorescent colloid pre-detection method according to an embodiment of the present invention is employed in the light-emitting diode packaging method, the range can be further reduced to less than 0.0025.

In conclusion, the present invention has been disclosed in the above preferred embodiments, and is not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100‧‧‧Lighting diode package method

S110, S112~S118, S120, S130‧‧‧ steps

Claims (13)

A method for pre-examination of a fluorescent colloid, comprising: providing a colloid step, providing a fluorescent colloid comprising a plurality of phosphor particles and an encapsulating colloid; and a weight detecting step for detecting whether the weight of the phosphor colloid meets a predetermined weight range And a chromaticity detecting step of detecting whether the chromaticity of the fluorescent colloid conforms to a predetermined chromaticity range. The method of pre-detecting a colloidal gel according to claim 1, wherein in the step of providing a colloid, the encapsulating colloid of the phosphor colloid is a silicone or a resin. The method of pre-detecting a colloidal gel according to claim 2, wherein the color detecting step detects only the phosphor colloid having a weight in accordance with the predetermined weight range. The fluorescent colloid pre-detecting method according to claim 3, wherein the color detecting step comprises: a fluorescent colloid exciting step of irradiating the fluorescent colloid with initial light to excite the fluorescent powder particles, And causing the phosphor particles to be excited to emit an excitation light having a chromaticity; and a chromaticity range determining step of measuring a value of the chromaticity of the excitation light and determining the excitation of the fluorescent colloid Whether the chromaticity of light falls within the predetermined chromaticity range. A method for pre-detecting a colloidal colloid as described in claim 4, wherein the initial The light is blue light. The fluorescent colloid pre-detection method according to claim 5, wherein the predetermined chromaticity range includes a plurality of sub-intervals, and in the determining step, it is further determined that the chromaticity of the fluorescent colloid falls on Which of the subintervals is to classify the phosphor colloid. The fluorescent colloid pre-detection method according to claim 6, wherein in the chromaticity detecting step, the predetermined chromaticity range is defined in a CIE color space, and the predetermined chromaticity range is in an X-axis of a CIE color space. The range of the and/or Y axis does not exceed 0.0025. The method of pre-examination of the phosphor colloid of claim 7, further comprising a recycling step comprising: a collecting step, the collecting weight does not meet the predetermined weight range and/or the chromaticity does not meet the predetermined chromaticity range The phosphor colloid; the separating step, separating the phosphor particles of the phosphor colloid collected by the collecting step from the encapsulating colloid; and recovering the phosphor powder particles obtained by the separating step. The method of pre-examination of the phosphor colloid of claim 8, wherein the recovering step further comprises: using the recovered phosphor powder particles for the step of providing a colloid. A light emitting diode packaging method includes: Providing a plurality of fluorescent colloids which are subjected to a pre-inspection of a fluorescent colloid pre-test method according to any one of claims 1 to 9 to meet a predetermined standard; and a packaging step comprising: providing one having a plurality of strips of lead frames; and the phosphor colloids meeting the predetermined criteria are respectively provided to the lead frames. The method of claim 12, further comprising a curing step after the step of packaging: after providing the fluorescent colloids meeting the predetermined standard to the lead frames, curing is performed The fluorescent colloids of the standard are predetermined. The LED package method of claim 10, wherein the lead frame is provided with a light emitting diode chip. The LED package method of claim 10, wherein the phosphor colloids are provided in a spherical shape in the step of providing the phosphor colloids to the lead frames.