Heat substrate summary introduction LED and the technical development trend analysis

Heat substrate summary introduction LED and the technical development trend analysis

With the global environmental protection consciousness, energy saving up has become a current trends. LED industry in recent years is the most popular one of purpose sort industry. Now, LED products already have an energy, save electricity, high efficiency, the reaction time is fast, and long life cycle, and does not contain mercury, has the environmental benefits; Etc. However, often LED high power input power is about 20% can convert light, only 80% of the electrical energy are converted to heat energy. Generally speaking, when LED the heat energy produced if cannot export, will make LED to high temperature, and then face "shadow ring product life cycle, the luminous efficiency, stability, and surface temperature, and LED the luminous efficiency and life of the relationship between the following will use the relationship chart for further instructions.

1, LED heat way

According to different types of packaging technology, the heat dissipation methods also different from all kinds of cooling way, and LED the way for roughly can:

Cooling way explains:

(1). From the air cooling

(2). Heat directly by the System circuit board export

(3). The heat through gold line is derived

(4). If the eutectic and Flip chip process, through the heat through holes to system is derived and circuit board
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2, the LED cooling substrate

Heat the webmaster if use LED the heat dissipation substrate materials itself has a better thermal conductivity, will heat source from crystal grain export LED. Therefore, we from the heat in the narratives, LED way can be heat LED base board subdivision two large categories, respectively crystal grain of substrate and LED system, the two kinds of different circuit of the base board heat were carrying LED grain and LED chip will LED grain light at the heat energy produced by cooling and grain size, LED board to system, and then by the atmospheric
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3, LED ceramic thermal substrate is introduced

How to reduce the grain ceramic substrate LED heat of the thermal resistance to the ascending LED one of the most main topic efficiency, according to its production lines if method can be divided into thick film ceramic substrates, low temperature co-firing multi-layer ceramics, and film ceramic substrates three respectively, stated below:
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4, the international leaders LED products development trend

At present, the LED the trend of the development of the product, the packaging companies from LED the recently published LED products power and size, high power that view was, small size products for the development of the industry at present, the LED on, and they are all use ceramic thermal substrate as its LED the way heat grain. Therefore, ceramic substrates in high heat power, small size LED products in structure, has become an important part of the phase when, the following table 2 for domestic and international main that LED product development situation and product categories for easy to collect.

5, conclusion

To improve the efficiency and service life LED, solve the problem is to heat LED products at this stage of the most important issues, LED a industry development is also high power, high brightness, small size LED products for its development, therefore, key provide has its high heat, the size of the precision of cooling boards, also become the future in heat LED the trend of the development of the substrate. At present to nitriding aluminum plate replace alumina boards, or eutectic or flip chip process instead of playing gold thread of grain/substrate combining ways to improve the efficiency of the development LED to mainstream. In this development tendency, the base board itself to heat the line registration accuracy requirement for tough, and be very high heat dissipation sex, small size, metal line adhesion good characteristics, therefore, use HuangGuangWei shadow system for film ceramic thermal boards, will be LED light to promote constantly high power ascending one of important catalyst.

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