Browsing by Author "Tarntair, Fu-Gow"

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Development and Fabrication of AlGaInP-Based Flip-Chip Micro-LEDs
(2018-01-01)
Horng, Ray-Hua
;
Chien, Huan-Yu
;
Chen, Ken-Yen
;
Tseng, Wei-Yu
;
Tsai, Yu-Ting
The fabrication of AlGaInP-based flip-chip micro light-emitting-diodes (LED; emitting area: 4.5 mil x 5 mil) with horizontal electrodes is reported in this paper. The thickness of the epitaxial layer of the thin LED structure was reduced to 50% of that of the traditional thick LED, whereas carrier concentration in the n-type GaAs contact layer was increased to 5 x 10(18) cm(-3) to meet the Ohmic contact requirement. At a current injection of 5 mA, the thin LED exhibited a forward voltage, output power, and external quantum efficiency of 1.8 V, 1.9 mW, and 19%, respectively. The optoelectronic performance of the thin LED was as good as that of the traditional thick red LED. The technique proposed by this paper can be used to integrate AlGaInP-based LEDs with nitride LEDs for full-color display applications.
Fabrication and Study on Red Light Micro-LED Displays
(2018-01-01)
Horng, Ray-Hua
;
Chien, Huan-Yu
;
Tarntair, Fu-Gow
;
Wuu, Dong-Sing
;
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A red-light micro LED display made of an AlGaInP epilayer with a resolution of 64 x 32 pixels, a pitch of 175 mu m and a luminous area of 1 cm x 0.5 cm was fabricated and characterized in this study. The AlGaInP epilayer was bonded to double polished sapphire substrate by wafer-bonding technique and then removing the absorbing GaAs substrate. In this design, the ITO was applied as one of the conducting electrodes of the emitting surface, which can be beneficial since the emitting light is not shielded by metal electrodes. The other key process for LED panel fabrication is planarization. Polymer material was used to fill the gap between each pixel, which was used to prevent a short or open circuit using the planarization process. The driving mode of this display is passive multi-electrode addressable controlling. The luminance of this micro-LED panel is more than 450 nits with an operating voltage of 3 V which is three times higher than that of the OLED operating in the same driving mode.