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April 15-16, 2019 | Frankfurt, Germany

Applied Physics & Laser, Optics and Photonics

International Conference on

Materials Science and Nanotechnology | Volume: 3

Internal quantum efficiency of UV μLED chips for display

Yoshihiko Muramoto, Masahiro Kimura

and

Akihiro Kondo

Nitride Semiconductors Co., Ltd., Japan

icro light emitting diode (μLED) displays

have been in development. When using

three-color, i.e., red, blue, and green LEDs, or blue

LEDs that excite red and green phosphors, many

challenges arise in mass production, cost, and

quality. Our group has devised an ultraviolet (UV)-

excited red, green, and blue (RGB) display that

excites red, green, and blue phosphors using UV-

LEDs. Tests confirm that the display’s efficiency is

improved by the use of the micro-sized UV-LED

chips that emit in the near-ultraviolet range. The

UV μLED chip emitting at 385 nm exhibited a more

linear output than a 400-nm purple μLED chip.

This study examines how the composition and

crystal defects of a light-emitting layer affect the

light emission efficiency of a UV μLED chip from

the perspective of internal quantum efficiency

(IQE).