The future direction of development of the LED 400W chip, must be closely integrated package technology development. Package technology becomes more mature on the basis, the size of the LED chips will get smaller, the brightness of the LED chip is getting brighter, more and more drive current.
In 2001, the maximum luminous flux of the Taiwan LED power chip 14 * 14mil 0.5LM. In 2012, Taiwan's LED power chip 10 * 23mil highest luminous flux has been reached for the 10LM.
In 2001, the maximum luminous flux of LED high-power chips in Taiwan 45 * 45mil 10LM. By 2012, the Taiwan LED 200W chips 45 * 45mil highest luminous flux up to 140LM.
The future, the growth of the luminous flux of the LED strip lights may be getting slower and slower, and the direction of development of the LED chip has also become a big issue of great concern to the industry. I think that the LED chip higher and higher toward the luminous efficiency, the size is getting smaller and smaller, the drive power is increasing the development of these three directions.
In exploring this topic before, let's take a look at the relationship between the size of the LED chip, current, voltage, power and heat, the temperature.
① First, we want to understand a formula: Power = current * voltage.
② Second, we want to understand a law: the law of conservation of energy - a variety of form of energy conversion directions and conditions limit its value unchanged, energy conversion, energy can not be created or destroyed.
③ Furthermore, we have to understand electricity energy conversion of the LED chip form is divided into two types: heat and light.
④ by the above formula, law and transformation patterns to draw the following summary: high power led chip size, regardless of their size, as long as its power (electricity), luminous flux (light), then the LED chip to power the energy converted to heat the heat will the same.
⑤ from ④ point, assuming that the LED Blue 150W chip to convert electrical energy into light and heat process, its heat can not export, then available to the following conclusion: the size of the LED chip size LED chip temperature relationship is inversely proportional. And then simply, is the large size of the chip and the small size of the chip, sharing the same heat, the small size of the chip temperature is relatively higher than the large size of the chip temperature.
⑥ from the different sizes of the same current drive chip analysis:
11 * 24mil = 264mil2 The the applicable 20mA current drive 264mil2/20mA = 13.2mil2/mA;
6 * 6 mil = 36mil2, also apply to 20mA current drive; 36mil2/20mA = 1.8mil2/mA;
Can be concluded from the above: the size of the chip size in the end for what the current drive, there is no fixed formula.
We know that 11 * 24mil generally blue-white chip and substrate is of Al2O3 (aluminum oxide, also known as sapphire, transparent body), there is no electrode, two electrodes are fabricated on the chip the same side - surface. This structure is called the surface of chip structures.
6 * 6 mil is generally red chip, general substrate of GaAs (gallium arsenide, absorption, dark gray solid) can be conductive substrate is generally negative, the surface of a cathode production, this structure is referred to as vertical chip structure.
By the above two types of chip architecture can be analyzed: as soon as possible to the high power led chip heat conduction out of the size of the drive current to the LED chips of different sizes by the size is not related.