2008
DOI: 10.1063/1.2963030
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Enhanced light extraction efficiency from AlGaInP thin-film light-emitting diodes with photonic crystals

Abstract: We investigate the use of photonic crystals for light extraction from high-brightness thin-film AlGaInP light-emitting diodes with different etch depths, lattice constants, and two types of lattices (hexagonal and Archimedean). Both simulations and experimental results show that the extraction of high order modes with a low effective index neff is most efficient. The highest external quantum efficiency without encapsulation is 19% with an Archimedean A7 lattice with reciprocal lattice constant G=1.5k0, which i… Show more

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Cited by 34 publications
(22 citation statements)
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“…In order to solve the problem, several method has been proposed, such as surface texture [3], photonic crystal [4], changing the chip shape [5], and auxiliary of transparent contact layer (TCL) on the GaP window layer [6]. Recently, the indium tin oxide (ITO) as TCL has exhibited as one of the most promising material for enhancement of light extraction in AlGaInP-base LED due to its excellent conductivity and optical transparency in the range of visible wavelength [7].…”
Section: Introductionmentioning
confidence: 99%
“…In order to solve the problem, several method has been proposed, such as surface texture [3], photonic crystal [4], changing the chip shape [5], and auxiliary of transparent contact layer (TCL) on the GaP window layer [6]. Recently, the indium tin oxide (ITO) as TCL has exhibited as one of the most promising material for enhancement of light extraction in AlGaInP-base LED due to its excellent conductivity and optical transparency in the range of visible wavelength [7].…”
Section: Introductionmentioning
confidence: 99%
“…Another technique under extensive ongoing investigations is to use photonic crystals, which are supposed to have the potential of signif- icantly increasing the light-extraction efficiency. However, it is still difficult for the photonic crystal technique to compete with the TIP and thin-film techniques since the highest EQE of AlGaInP LEDs using photonic crystals is only approximately 19% [6].…”
Section: Introductionmentioning
confidence: 99%
“…T HROUGH the Bragg diffraction with the photonic crystal (PhC), guided light in PhC LED chips can escape from the deleterious trapping effects due to total internal reflection [1]- [7]. Aperiodic PhC patterns have been reported for isotropic light extraction [6].…”
Section: Introductionmentioning
confidence: 99%