CURABLE ORGANOPOLYSILOXANE COMPOSITION AND ITS APPLICATION

Abstract

The present invention provides a curable organopolysiloxane composition comprising one or more from a group including magnesium oxide, magnesium hydroxide, magnesium carbonate, hydrotalcite, hydrotalcite-like compounds, and magnesium silicate. The application of said organopolysiloxane composition in semiconductor devices of light emitting components may effectively block the permeation of hydrogen sulfide or sulfide and prevent silver-plated laminates from being oxidated without affecting the original light output efficiency, so that silver-plated laminates may be effectively protected and anti-sulfidation effect may be enhanced.

Claims

1. A curable organopolysiloxane composition, wherein the composition also includes 0.1-50 wt % of nonorganic magnesium compounds, and a particle size of the nonorganic magnesium compounds is greater than 0.1 μm and is less than or equal to 50 μm.

2. A curable organopolysiloxane composition of claim 1, wherein the nonorganic magnesium compounds is one or more from a group including magnesium oxide, magnesium hydroxide, magnesium carbonate, hydrotalcite, hydrotalcite-like compounds, and magnesium silicate.

3. A curable organopolysiloxane composition of claim 1, wherein the content of said nonorganic magnesium compounds is 0.1-20 wt % and the particle size is greater than 0.1 μm and is less than or equal to 20 μm.

4. (canceled)

Description

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Implementation Procedures and Conditions:

[0014] 1. High-temperature and high-humidity reflow soldering: Place the lamp beads in a container at 85° C. and 85% RH for 24 hours. Take out the lamp beads and wipe them dry before placing them into a reflow soldering tunnel at 265° C. for 5 minutes for two rounds.

[0015] 2. High-temperature ageing: Place the lamp beads in a hot air circulation drying oven at 200° C. for 72 hours.

[0016] 3. Temperature cycling: −40° C. to 100° C. single-tanked thermocycler, 20 cycles per day, 10 days in all.

[0017] 4. Sulfidation: Fill 10 g of sulfur powder and 300 cc of mineral water at a bottom of a 20-litre enclosed container (diameter=30 cm; height=30 cm). Attach the chips of lamp beads to be tested face down inside a top end of the container. Place the lamp beads in a circulation thermostatic drying oven at 80° C. for 8 hours. Then take them out and clean up the corrosion on the silver lead of the mount. Then inspect their brightness (Lv) and color temperature on an inspection machine specifically for lamp beads.

[0018] 5. Bare die permeability: The permeability rate (%) with the spectrophotometer set at 420 nm (light path=l0 mm).

[0019] 6. Hardness: Measured according to ASTM D 2240 D.

Embodiment 1

[0020] Evenly mix polymethylphenylsiloxane polymer containing silica bonded vinyl group with polymethylphenylsiloxane polymer containing silica bonded hydrogen, wherein the content of silica bonded vinyl group is 4.5 wt %, the content of silica bonded hydrogen is 0.13 wt %, and the content of silica bonded phenyl group is 49 wt %. Platinum-1,3-divenyl-1,1,3,3-tetramethyldisiloxane complex serves as a catalyst (with platinum weighing 3 ppm of the total weight of the entire structure). And 1-ethynylcyclohexanol serves as a work time conditioning agent (weighing 150 ppm of the total weight of the entire structure). After the foregoing components are evenly mixed, the viscosity of the mixture is 3500 cps at 25° C. Divide the mixture evenly into three portions, respectively (A), (B), and (C).

[0021] (A) is used as a blank test;

[0022] 3 wt % of Magnesium hydroxide (Sigma-Aldrich company U.S.A, reagent grade, 95% purity) is mixed into (B);

[0023] 5 wt % of the foregoing Magnesium hydroxide is mixed into (C);

[0024] Then add 10 wt % of YAG fluorescent powder respectively into (A), (B), and (C). Evenly mix and vacuum de-bubble. Then discharge the mixtures into a mount of a three-chip (0.2 W*3) 5050 SMD LED (8*15 lamp beads per chip) with a capacity measuring digital control dispenser MPP-1 (Musashi Engineering, Inc. Japan). Then place the mount into a hot air circulation drying oven at 80° C. for 1 hour and into a hot air circulation drying oven at 150° C. for 2 hour. Take it out, leave it to cool, and run subsequent reliability test.

Reliability Result:

[0025] (Average result of 8*15 lamp beads per chip, 120 in all)

TABLE-US-00001 TABLE 1 (A) (B) (C) Original GOOD GOOD GOOD appearance after curing Hardness at 25° C. 45°D 47°D 50°D After GOOD GOOD GOOD high-temperature and high-humidity reflow soldering 200 cycles of PASS PASS PASS temperature cycling Average brightness 22.0 22.2 22.5 before sulfidation (Lv) Average brightness 16.4 21.8 22.3 after sulfidation (Lv) Brightness decay 25.4% 1.8% 0.9% Average color 5300-5800 5300-5600 5300-5600 temperature before sulfidation (K°) Average color 5800-6400 5300-5600 5300-5600 temperature after sulfidation (K°) Further, (A), (B), and (C) without fluorescent powder are made into transparent bare dies of 20 mm * 50 mm * 1 mm (thickness).

TABLE-US-00002 TABLE 2 (A) (B) (C) Original light 85 78 75 transmittance rate (%) (at 420 nm) Transmission rate 84 78 75 after 200° C./72 hours (%)

Embodiment 2

[0026] Evenly mix polymethylphenylsiloxane polymer containing silica bonded vinyl group with polymethylphenylsiloxane polymer containing silica bonded hydrogen, wherein the content of silica bonded vinyl group is 4.7 wt %, the content of silica bonded hydrogen is 0.14 wt %, and the content of silica bonded phenyl group is 49 wt %. Platinum-1,3-divenyl-1,1,3,3-tetramethyldisiloxane complex serves as a catalyst (weighing 3 ppm of the total weight of the entire structure). And 1-ethynylcyclohexanol serves as a work time conditioning agent (weighing 150 ppm of the total weight of the entire structure). After the foregoing components are evenly mixed, the viscosity of the mixture is 3500 cps at 25° C. Divide the mixture evenly into three portions, respectively (A), (B), and (C).

[0027] (A) is used as a blank test;

[0028] 5 wt % of Magnesium hydroxide (Sigma-Aldrich company U.S.A, reagent grade, specific surface area=130 m.sup.2/g, particle size<25 μm (XRD)) is mixed into (B);

[0029] 5 wt % of talc powder (Sigma-Aldrich company U.S.A, 10 μm) is mixed into (C);

[0030] Then add 10 wt % of YAG fluorescent powder (Y959) respectively into (A), (B), and (C). Evenly mix and vacuum de-bubble. Then discharge the mixtures into a mount of a three-chip (0.2 W*3) 5050 SMD LED (8*15 lamp beads per chip) with a capacity measuring digital control dispenser MPP-1 (Musashi Engineering, Inc. Japan). Then place the mount into a hot air circulation drying oven at 80° C. for 1 hour and into a hot air circulation drying oven at 150° C. for 2 hour. Take it out, leave it to cool, and run subsequent reliability test.

Reliability Result:

[0031] (Average result of 8*15 lamp beads per chip, 120 in all)

TABLE-US-00003 TABLE 3 (A) (B) (C) Original GOOD GOOD GOOD appearance after curing Hardness at 25° C. 52°D 56°D 55°D After GOOD GOOD GOOD high-temperature and high-humidity reflow soldering 200 cycles of PASS PASS PASS temperature cycling Average brightness 24.2 25.2 24.0 before sulfidation (Lv) Average brightness 18.4 25.0 21.5 after sulfidation (Lv) Brightness decay 23.9% 0.8% 10.0% Average color 5200-5800 5300-5600 5300-5600 temperature before sulfidation (K°) Average color 5700-6400 5300-5600 5400-5700 temperature after sulfidation (K°) Further, (A), (B), and (C) without fluorescent powder are made into transparent bare dies of 20 mm * 50 mm * 1 mm (thickness).

TABLE-US-00004 TABLE 4 (A) (B) (C) Original light 85 83 60 transmittance rate (%) (at 420 nm) Transmission rate 84 83 60 after 200° C./72 hours (%)

[0032] The foregoing tables show that the addition of nonorganic magnesium compounds into organopolysiloxane may effectively block the permeation of hydrogen sulfide or sulfide and prevent silver-plated laminates from being oxidated without affecting the average brightness before sulfidation, so that silver-plated laminates may be effectively protected and anti-sulfidation effect may be enhanced. Further, after the addition of nonorganic magnesium compounds, brightness decay is kept under 2%.