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Author: search.filters.author.Chang, CWSubject: search.filters.subject.omni-directional reflector (ODR)

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    Improvement in light-output efficiency of AlGaInP LEDs fabricated on stripe patterned epitaxy
    (2005-12-01)
    Lee, YJ
    ;
    Tseng, HC
    ;
    Kuo, HC
    ;
    Wang, SC
    ;
    Chang, CW
    Quaternary AlGaInP light-emitting diodes (LEDs) operating at a wavelength of 630 nm with a stripe-patterned omni-directional reflector (ODR) were fabricated. It is demonstrated that the geometrical shape of stripe-patterned structure improves the light extraction efficiency by increasing the extraction of guided light. The optical and electrical characteristics of stripe-patterned ODR LEDs are presented and compared to typical ODR and distributed Bragg reflector (DBR) LEDs with the same epitaxial structure and emitting wavelength. It is shown that the output power of the stripe-patterned ODR LED exceeds that of the typical ODR and DBR LEDs by a factor of 1.15 and 2 times, respectively, and with an acceptable forward voltage of about 2.2 V.
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    Item type:Item,
    AlGaInP light-emitting diodes with stripe patterned omni-directional reflector
    (2006-02-01)
    Lee, YJ
    ;
    Lu, TC
    ;
    Kuo, HC
    ;
    Wang, SC
    ;
    Liou, MJ
    An n-side-up AlGaInP-based light-emitting diode (LED) with a stripe-patterned omni-directional reflector (ODR) was fabricated by adopting the adhesive-layer bonding scheme. Comparing to the conventional ODR LED, the stripe-patterned ODR LED significantly enhanced the output power with an only slight higher forward voltage. This improvement was analyzed by the scanning near-field optical microscope (SNOM) and could be attributable to the geometrical shape of stripe patterns that redirects the guided light towards to the escaping cone of the LED surface. The optimized dimension of stripe patterns was also calculated by simply modeling a LED dice with a stripe-patterned ODR structure, according to optical ray-tracing method.