TWI484664B - Method for spreading fluorescent particles - Google Patents

Description

Fluorescent powder coating method

The present invention relates to a method for coating a phosphor powder, and more particularly to a method for coating a phosphor powder of a light-emitting element.

Referring to the first figure, it is a flow chart of a conventional phosphor coating method. First, as in step S100, a container 200 (as shown in the second figure) is provided, and a liquid 202 is injected into the container 200, the liquid 202 having to be greater than a predetermined height.

Thereafter, in step S102, a phosphor powder 204 is disposed in the liquid 202, and a stirring device (not shown) is used to uniformly distribute the phosphor powder 204 in the liquid 202.

Step S104, placing a substrate 208 provided with at least one illuminating die 206 into the liquid 202, wherein the height of the substrate 208 must be less than the predetermined height of the liquid 202.

Step S106, after the phosphor powder 204 settles on the surface of the light-emitting die 206, the liquid 202 is removed by a liquid removing device 210 (as shown in the third figure); wherein the liquid removing device 210 can be, for example, a drain pipe or Small pump.

However, when the liquid is removed 202, the liquid 202 will drive the phosphor powder 204 partially settled on the surface of the illuminating crystal grain 206, so that the uniformity of the phosphor powder 204 on the illuminating crystal grain 206 will be made. Falling, causing the light-emitting die 206 to pass through The light passing through the phosphor 204 produces unevenness.

In view of the prior art, it is an object of the present invention to provide a method of coating phosphor particles.

In order to achieve the object of the present invention, the present invention provides a method for coating phosphor powder particles, the method for coating the phosphor powder particles comprising the steps of: firstly, setting a plurality of phosphor particles in a liquid, and The phosphor particles are placed on the surface of the liquid; and then at least one of the light-emitting elements is brought into contact with the liquid and the phosphor particles so that the liquid and the phosphor particles are attached to the light-emitting element.

In summary, the phosphor powder coating process provided by the present invention can uniformly deposit the phosphor particles on the light-emitting element, thereby improving the light color stability and the uniformity of the light color, thereby improving product output and good quality. rate.

200‧‧‧ container

202, 42‧‧‧ liquid

204‧‧‧Fluorescent powder

206‧‧‧Lighting grain

208, 70‧‧‧ substrate

40‧‧‧Fluorescent powder particles

50‧‧‧Lighting elements

60‧‧‧Transparent film

72‧‧‧ circuit layer

80‧‧‧welding line

S100~S106‧‧‧Fluorescent powder coating process

S300~S306‧‧‧Flame powder coating process

The first figure is a flow chart of a conventional phosphor coating method.

The second and third figures are schematic diagrams showing the manufacturing process of the phosphor powder coating method corresponding to the first figure.

The fourth figure is a flow chart of the method for coating the phosphor particles of the present invention.

The fifth figure is a schematic view of a coating method of the phosphor powder particles of the present invention.

Fig. 6 is a view showing a light-emitting element having a phosphor powder by a coating method of phosphor particles shown in Fig. 5.

The seventh drawing is another light-emitting element having phosphor powder particles obtained by the coating method of the phosphor particles shown in FIG.

Fig. 8 is another schematic view showing a method of coating the phosphor particles of the present invention.

The ninth drawing shows a light-emitting element having phosphor particles as a method of coating the phosphor particles shown in the eighth embodiment.

Fig. 10 is a view showing another light-emitting element having phosphor particles as obtained by the coating method of the phosphor particles shown in the eighth embodiment.

Referring to the fourth figure, a flow chart of the method for coating the phosphor powder particles of the present invention is shown. The method for coating the phosphor particles is mainly for attaching the phosphor particles to the light-emitting elements, and the phosphor particles are wavelength-converted with a portion of the light emitted from the light-emitting elements to generate a wavelength-converted light. The light emitting element can be, for example, but not limited to, a light emitting diode (LED) die.

The coating method of the phosphor powder particles comprises the following steps:

Step S300: The plurality of phosphor particles 40 are placed in a liquid 42, and the phosphor particles 40 are placed on the surface of the liquid 42, as shown in FIG. The phosphor particles 40 are insoluble or poorly soluble in the liquid 40, and the phosphor particles 40 are fixed by the surface tension of the liquid 42 and the van der Waals force between the molecules of the phosphor particles 40. The thickness layer is suspended on the surface of the liquid 40 such that the phosphor particles 40 can be present in the liquid 42 and on the surface of the liquid 42. The liquid 42 may be a pure liquid or a mixed liquid, and the liquid 42 is preferably a non-viscous liquid such as pure water; or the liquid 42 may be a viscous liquid such as an epoxy resin ( Epoxy) or silicone resin.

Step S302, contacting at least one light-emitting element 50 with the liquid 42 and the phosphor particles 40 to attach the phosphor particles 40 and the liquid 42 to the light-emitting element 50. Preferably, the phosphor particles 40 and the liquid 42 are attached to the light emission path of the light-emitting element 50.

As shown in the fifth figure, it is a schematic diagram of a method for coating a phosphor powder of the present invention. A plurality of light emitting elements 50 are disposed on a light transmissive film 60 (eg, a blue film) and are opened by a crystal expanding process to open a distance between adjacent two light emitting elements 50. Subsequently, the light-transmissive film 60a provided with the light-emitting elements 50 is inverted, and the light-emitting elements 50 face the liquid 42 and the phosphor particles 40. Thereafter, the light-emitting elements 50 are brought into contact with the liquid 42 and the phosphor particles 40 such that the phosphor particles 40 and the liquid 42 can adhere to the light-emitting elements 50.

When the liquid 42 is a non-viscous liquid, the liquid 42 is removed by drying to condense the phosphor particles 40 on the light-emitting elements 50 (step S304); and when the liquid 42 When it is a viscous liquid, the liquid 42 is solidified, and the phosphor particles 40 are located in the solidified liquid 42 (step S306).

Finally, the phosphor particles 40 on the light-emitting elements 50 can be as shown in the sixth and seventh figures, wherein the difference between the sixth and seventh figures is mainly that the phosphor particles 40 are attached to the The position on the light-emitting element 50 causes a difference in the depth at which the light-emitting elements 50 are immersed in the phosphor particles 40 and the liquid 42. When only the upper surface of the light-emitting elements 50 contacts the phosphor particles 40 and the liquid 42, the finally formed phosphor particles 40 are only attached to the upper surface of the light-emitting elements 50; When the element 50 and the light-transmissive film 60 are immersed in the phosphor particles 40 and the liquid 42, the finally formed phosphor particles 40 simultaneously cover the light-emitting elements 50 and the film light film 60 is provided. The surface of the light source element 50 is equal.

It should be noted that the light-emitting elements 50 disposed on the transparent film 60 may also be The phosphor particles 40 are applied before the completion of the crystal expansion process, and the phosphor particles 40 are attached to the light-emitting elements 50, and then the light-emitting elements after the completion of the application of the phosphor particles are completed. 50 is used for the crystal expansion process, and the completed pattern is as shown in the sixth figure.

Referring to the eighth figure, another schematic diagram of the phosphor powder coating method of the present invention is shown. The at least one light-emitting element 50 is disposed on a substrate 60b by a die bonding process. The substrate 70 has a circuit layer 72. The light-emitting element 50 is electrically connected to the circuit layer 72 through at least one bonding wire 80. Thereafter, the light-emitting element 50 faces the phosphor particles 50, and the light-emitting element 50 is immersed in the phosphor particles 40 and the liquid 42 at a predetermined height, so that the phosphor particles 40 are attached to the phosphor particles 40. On the light-emitting element 50.

When the liquid 42 is a non-viscous liquid, the liquid 42 is removed by drying to condense the phosphor particles 40 on the light-emitting element 50 (step S304); and when the liquid 42 is In the case of a viscous liquid, the liquid 42 is solidified and the phosphor particles 40 are located in the solidified liquid 42 (step S306).

However, depending on the depth at which the light-emitting element 50 is immersed in the phosphor particles 40 and the liquid 42, the types of the phosphor particles 40 adhering to the light-emitting elements 50 may be different. As shown in the ninth and tenth figures. In the ninth figure, the phosphors 40 are attached only to the upper surface of the light-emitting elements 50, the bonding wires 80, and the upper surface of the substrate 70. In the tenth figure, the phosphor particles 40 are simultaneously The light-emitting elements 50, the bonding wires 80, and the substrate 70 are covered.

In summary, the phosphor coating process provided by the present invention can uniformly deposit the phosphor particles 40 on the light-emitting element 50, thereby improving the light color stability and the uniformity of the light color, thereby improving product output and Yield.

However, the above description is only a preferred embodiment of the present invention, and the present invention cannot be limited. The scope of the application, that is, the equivalent changes and modifications of the scope of the patent application of the present invention, should remain within the scope of the patent protection scope of the present invention.

S300~S306‧‧‧Flame powder coating process

Claims (9)

A method for coating phosphor particles, comprising: a) disposing a plurality of phosphor particles in a liquid, and suspending the phosphor particles on the surface of the liquid, wherein the phosphor particles are The surface tension of the liquid and the intrinsic van der Waals force of each of the phosphor particles are suspended in the liquid surface with a certain thickness; and b) the at least one illuminating element faces the liquid and the phosphor particles, And contacting the liquid and the phosphor particles to adhere the liquid and the phosphor particles to the light-emitting element. The method of coating a phosphor powder according to claim 1, wherein the liquid is a viscous liquid. The method for coating phosphor particles according to claim 2, after step b, further comprises a step c: curing the liquid. The method of coating a phosphor powder according to claim 1, wherein the liquid is a liquid having no viscosity. The method for coating the phosphor particles according to claim 4, after step b, further comprising a step d: removing the liquid, causing the phosphor particles to coagulate and adhere to the light-emitting element. . The method for coating phosphor particles according to claim 1, wherein the phosphor particles are attached to an upper surface of the light-emitting element. The method for coating phosphor particles according to claim 3, wherein the phosphor particles coat the light-emitting element. The method for coating phosphor particles according to claim 1, wherein the phosphor particles are insoluble or poorly soluble in the liquid. The method of coating a phosphor powder according to claim 1, wherein the liquid is a pure liquid or a mixed liquid.