Shandong Taixing vice president Ma Wenbo: heat graphene with large angle uniform light LED filament lamp R & D and industrialization

LED industry in recent years, the degree of hot filament lamp can be said to be bursting, from the current situation in Jiangsu and Zhejiang before slowly becomes the hot national and global LED filament heat. Graphene is not only in the LED industry, but also in almost all areas of materials are super hot. In February 20th, by LEDinside, CNLED (formerly Chinese LED network) will host the market analysis of the chief adviser (ShangHai Railway Station), Shandong crystal Taixing Vice President Ma Bo set two "hot" published "the development of graphene with large angle heat uniform light LED filament lamp and industry" speech.

Shandong Taixing vice president Mr. Ma Jing Bo

Is LED really ready to replace the incandescent lamp?

Filament lamp, incandescent lamp. At present the whole world has released a roadmap of incandescent lamp, incandescent lamp Chinese of more than 60 watt has explicitly banning the production and sales of other western countries (the United States, Canada, Australia) have a clear exit of incandescent lamp. So LED is really ready to replace incandescent lamps?

Dr. Ma Wenbo made the following 6 questions: incandescent light efficiency specifications from 25 watts to 100 watts completely replaced, in the same volume of LED is ready? The incandescent lamp luminous effect of the full range of light emitting light curves furnished, the current LED products are not able to fully realize? Third, the incandescent lamp dazzling visual effects LED true? Fourth, the low cost price of incandescent lamp LED achieved? Fifth, incandescent light weight LED can not be achieved? Sixth, incandescent lamp color index of nearly 100% of the LED lighting products can also be achieved?

Why do it?

Do not forget the beginning of the heart, return to the product. From the perspective of the development of the incandescent lamp light source, is the perfect product, because it has close to 100 CRI, and environmental protection, no pollution of toxic and harmful substances, also very lightweight, low cost, visual effect by the vast majority of people accept. The energy-saving lamps, although there is a large angle of light, light effect is stronger than incandescent, but mercury, so the development of a few years will soon be replaced by LED.

For the LED began to enter people's sight, the concept of energy quickly became popular. Seen on the market basically in 80-90LM/W, than incandescent lamp is increased by 8 to 10 times, but also has the light emitting angle is relatively large, but the light angle is inferior to the incandescent lamp, this is also the reason that the LED filament lamp.

Filament lamp began in 2012, when Hongkong's stores have products, but the mainland did not, in the beginning of many manufacturers sought after in 2013, gradually mature today. Therefore, this product can see its key technical features, not only has a large luminous angle, higher than the traditional LED light effect, and environmental protection, light weight.

How to change the filament lamp

Due to the structure of the LED filament lamp, there is no excess heat dissipation structure. According to the three elements of heat transfer conduction, convection and radiation, the current filament lamp is not conductive, only convection and radiation. But mainly convection heat radiation, the proportion is small. If the introduction of graphene technology into the filament lamp, is to use graphene thermal radiation characteristics to increase the heat dissipation of filament lamps, to extend the service life of filament lamps.

Based on this idea, through comparative analysis on the same copper coated and non coated graphene, blackbody radiation property testing, can clearly see the coated with graphene, the radiation characteristic of it is very obvious, but not with graphene, no obvious characteristics of thermal radiation. In addition, the coating material is coated on the copper foil or aluminum foil, and the contrast thermal imaging experiment is carried out, and the results are consistent.

Based on the test results, the metal substrate graphene used in filament back position, LED heating heat generated by the heat radiated by graphene, and used to realize the effective thermal conductivity of gas convection bubble shell, lower temperature. According to the comparison with graphene and graphene coated products, you can see the coated with graphene chip junction temperature than the junction temperature not coated with graphene low 3-5, so you can see the chip junction temperature obviously reduced, thus prolonging the life of the filament.

Development trend of filament lamp

Two directions about the development trend of the filament Ma Wenbo mentioned crystal Taixing said layout. One is the flexible development direction, and the other is the intelligent direction.

At present, the LED industry has emerged a number of flexible products, but mainly straight filament or bent filament. Ma Wenbo said, speaking on the crystal Taixing is more important for flexible filament lamp can reach the main lighting products, crystal Taixing prepared to consider combining graphene and materials to achieve the requirements of the specifications of the main lighting light.

Another development direction of the intelligent LED filament lamp on the filament, Ma Wenbo said, because in the filament lamp are encountered in on way more, a filament 20 chips, each chip of the VF value is not the same, the difference of the VF values will lead to the current distribution is not uniform, but not uniform a current overload will lead to the root of the filament, the filament that would lead to a sharp decline in life expectancy. The crystal in Taixing filament inside a package of smart devices, the chip has good current limiting characteristics, ensure the filament current in the 10-12mA, this extended reliability will be very large.

Final destination