Japan Nitride invest in wholly owned subsidiary of Micro UV-LED

Yesterday (1), Japanese UV LED manufacturer Nitride Semiconductors announced the investment of 100 million yen (equivalent to about 6 million 140 thousand yuan) to set up a wholly owned subsidiary Micro Nitride. The subsidiary will focus on R & D, manufacturing and marketing of Micro UV LED chips for Micro LED display, and will start operation in November 1, 2018.

It is reported that there are currently two major ways to create Micro LED display. The first is to use the red and green blue light's three primary color LED, and the second is to achieve the full color of the red and green phosphor with the blue light LED through the blue LED.

Three in the primary color LED method, because of its fragile material, it can not produce a red chip. The installation of LED chips with high density, different structures and different colors is also very difficult. At the same time, their current, voltage and reaction speed are different, so it is difficult to control each chip.

And the Blue LED excitation method can integrate all the LED chips installed into the blue light LED, reduce the difficulty of installation, and achieve unity of power and voltage. However, Blu ray is active luminescence, while red and green light are generated by excitation, so there will be time lag of reaction rate. In addition, blue light excites low brightness of red and green light, resulting in poor color reproducibility.

(photo source: Nitride official website)

It is worth noting that Nitride Semiconductors uses UV-LED +RGB phosphor to solve this problem. The company discovered that the UV-LED chip with N layer and P layer super linear structure (SLS) has doubled the luminous efficiency (patent application). This is mainly due to the short distance of the diffusion current, the increase of the recombination rate of the luminescence, the enhancement of the internal quantum efficiency, the shorter distance between the emitting layer and the outside, and the improvement of the external quantum efficiency.

(photo source: Nitride official website)

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