1. The effect of wafer on the light decay of white LED
From the results of the current experiments, the effects of wafers on light decay fall into two broad categories: the first is that the material of the wafer is different, resulting in different attenuation. The commonly used blue wafer substrate materials are silicon carbide and sapphire, and the general structural design of silicon carbide. For a single electrode, the heat conduction effect is better. The sapphire is generally designed as a double electrode, the heat is difficult to be exported, and the heat conduction effect is poor. The second is the size of the wafer. When the wafer material is the same, the size difference is different.
2. Effect of solid crystal primer on light decay of white LED
The solid-state adhesives commonly used in the white LED packaging industry are epoxy resin, silicone resin, and silver glue. Each of the three has its own advantages and disadvantages, and should be considered comprehensively when selecting. Epoxy resin insulation has poor thermal conductivity, but high brightness; silicone resin has better thermal conductivity than epoxy resin, and has high brightness. However, due to the proportion of silicon component, the silicone resin and the ring in the fluorescent rubber remain on the side of the solid wafer. When the oxygen resin is combined, the interlayer phenomenon will occur. After the thermal shock, the peeling will cause the dead lamp; the thermal conductivity of the silver gel is better than the former two, which can prolong the life of the LED chip , but the absorption of light by the silver paste is compared. Large, resulting in low brightness. For the two-electrode blue chip, when the crystal is fixed with silver glue, the control of the amount of glue is also very strict, otherwise it is easy to generate a short circuit, which directly affects the yield of the product.
3. Effect of phosphor on the light decay of white LED
There are many ways to realize white LEDs. The most common and most mature one is to mix blue and yellow light into white light by applying a yellow phosphor on the blue light wafer. Therefore, the material of the phosphor is attenuated by white LEDs. great influence. The most popular phosphors in the market are YAG yttrium aluminum garnet phosphors, silicate phosphors, and nitride phosphors. Compared with blue LED chips, phosphors have the effect of accelerating aging white LEDs, and phosphors from different manufacturers The degree of influence of fading is also different, which is closely related to the raw material composition of the phosphor. Lehman Optoelectronics uses the best material white phosphor, which makes the white LEDs have a great improvement in attenuation control compared with their peers.
4. The effect of fluorescent glue on the light decay of white LED
Traditionally packaged white LEDs, fluorescent glues are generally epoxy or silica gel. The results of light decay experiments show that the life of white LEDs with silica gel is significantly longer than that of epoxy resins. One of the reasons is that the above two methods are used to package the finished LED. The silica gel has stronger UV resistance than the epoxy resin and the heat dissipation effect of the silica gel is better than that of the epoxy resin. However, under the same conditions, the initial brightness of the silica gel is higher than that of the epoxy. The resin powder is low, the most important reason is that the refractive index of silica gel (1.3-1.4) is lower than that of epoxy resin (1.5 or more), so the initial light effect is not as high as that of epoxy resin.
5. The effect of the bracket on the light decay of white LED
LED brackets mainly include copper brackets and iron brackets. The copper bracket has good thermal conductivity, good electrical conductivity and high price. The heat conduction and electrical conductivity of the iron bracket are relatively poor, and it is more likely to rust, but the price is cheap.
Most of the LEDs on the market use iron brackets. Brackets of different materials have different effects on the performance of LEDs, especially for light fading. This is mainly because the thermal conductivity of copper is much better than that of iron. The thermal conductivity of copper is 398W (mk), while the thermal conductivity of iron is only about 50W (mk), which is only 1/8 of the former, and the thickness of the plating layer of the stent. Also closely related. When selecting the bracket, it is also necessary to pay attention to whether the size of the cup of the bracket matches the light-emitting chip and the mold particle, and the quality of the matching quality directly affects the optical effect of the white LED, otherwise the shape of the spot is asymmetrical, and the yellow circle is easily caused. Black spots, etc., directly affect the quality of the product.
With the application of white LEDs in lighting, customer needs are constantly improving, we must constantly innovate, improve our product performance and improve our processes to meet customer needs as much as possible.
Plastic Coated Electric Kettle
The original stainless steel double wall Electric Kettle. This kettle comes with 100% stainless steel interior. Outside made by plastic for protect your hand in case that the hot stainless steel will scald your hand. No plastic in contact with hot water. The spacious kettle has a volume of 1.8 liters which give ample space to boil tea, coffee or soups in minutes. Lets you boil a huge quantity of liquid at a time and helps save time and electricity.
· Stainless Steel Body With Plastic Outside: Ergonomic in design, the electric kettle has a sturdy handle with smart contours to make your grip a firmer one. The stainless steel finish gives a glossy feel and boasts a rust-free performance. This stainless electric kettle comes with a convenient spout so that liquid can be easily poured from it directly into a container. It avoids any spillage and thus prevents your kitchen from getting messy.
· 360 degree rotational body with separated base: Enjoy the ease and convenience of cord-free serving with this stylish stainless steel kettle. Perfect for placing on the table for gatherings or leaving on the base for worry-free hot water any time of day.
· Automatic shut off when water boils or dry: This overheat safety protection feature of the electric Kettle helps to prevent hazardous accidents. The cordless electric kettle switches off if the water inside the kettle dries up. It also saves on electricity as it uses very less power.
· Lightweight and Portable: Carry your kettle anywhere to enjoy a warm cup of coffee or tea away from your home. Kettle not only looks good but maintains a high standard in terms of durability. Lightweight and its small dimensions snugly fit in your bag. Portable and small in size, this electric kettle makes a perfect travel companion.
· Cool touch Exterior: With out cool-touch design. You`ll be able to touch the outside of the kettle even when it`s boiling. There`s no risk of getting accidentally burnt, so it`s perfect for homes with young children.
Application:
Enjoy your coffee.
Cook egg for morning.
Boil some lemon tea
Plastic Coated Electric Kettle
Plastic Coated Electric Kettle,Household Plastic Kettle,Colorful Water Kettle,Auto Shut-Off Electric Kettle
Guangzhou Taipeng Electrical Appliances Technology CO., LTD. , https://www.taipengelectric.com