National Taiwan University

Dong-Ming Yeh

Chih-Chung Yang

Cheng-Hung Lin

Horng-Shyang Chen

Jian-Jang Huang

Cheng-Yen Chen

Chi-Feng Huang

Tsung-Yi Tang

Yen-Cheng Lu

Jeng-Jie Huang

Yung-Sheng Chen

Chih-Feng Lu

A method for forming a periodic structure is disclosed. A structural layer and an optical modulation element are provided. A light is emitted to pass through the optical modulation element to irradiate interference strips on the structural layer. A photoelectrochemical etching (PEC) is performed to form the periodic structure according the interference strips irradiated on the structural layer.

Method for forming periodic structure

A method for controlling the color contrast of a multi-wavelength light-emitting diode (LED) made according to the present invention is disclosed. The present invention includes at least the step of increasing the junction temperature of a multi-quantum-well LED, such that holes are distributed in a deeper quantum-well layer of the LED to increase luminous intensity of the deeper quantum-well layer, thereby controlling the relative intensity ratios of the multiple wavelengths emitted by the LED. The step of increasing junction temperature of the multi-quantum-well LED is achieved either by controlling resistance through modulating thickness of a p-type electrode layer of the LED or by modifying the mesa area size to control its relative heat radiation surface area.

Method for controlling color contrast of a multi-wavelength light-emitting diode

Growing community of inventors

Taipei, Taiwan

Dong-Ming Yeh