CompoundSemi reports: Hitachi Cable announced the development of high-power red LEDs, which increase the size of LED chips and use thin-line electrode structures to achieve a maximum luminous flux of up to 55 lm.
Hitachi Cable (hereinafter referred to as HC) supplies AlGaAs epitaxial wafers and AlGaInP epitaxial wafers, both of which are used to produce red LEDs. In response to the market demand for higher lumen efficiency, HC has also developed a higher brightness red LED chip (referred to as MR-LED chip) which has a special structure to form a metal reflective layer under the light emitting layer. Currently, the product has been supplied to LED packaging plants and other customers.
Increasing the size of the chip is one of the methods to increase the light output of each chip. However, this method has its limitations, and the larger the chip size, the more uniform the light-emitting layer is. Further, if a larger block electrode is used in the uppermost layer to obtain a uniform current distribution, light from the light-emitting layer is blocked again, thereby inevitably reducing light extraction efficiency. Therefore, in the process of developing a new LED chip, in order to solve this dilemma, the HC uses two electrode pads to obtain power, and then one body electrode connects the two branch electrodes, and the plurality of thin wire electrodes will extend from the body electrode to the most In the upper structure.
By using a thin wire electrode, HC successfully obtains a uniform current distribution across the surface of the chip without affecting the light-emitting effect of the emitter layer, thereby obtaining a luminous flux of 55 lm on a 1 x 1 mm LED chip - this is equivalent to 21 MR-LEDs. The light output of the chip (0.33 x 0.33 mm). The higher output makes LEDs more versatile, not only for display, but also as a source for projectors.
In the future, HC will continue to develop more efficient LED chips, including yellow and infrared LED chips, on existing high-power LED product lines.
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