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This study experimentally investigates the highly directional far-field emission distributions of GaN ultrathin-film light-emitting diodes (uTFLEDs) with optimized microcavity thickness and photonic crystal (PhC) parameters. Results show that directionality depends on guided mode extraction behaviors and strong microcavity effects. The proposed GaN PhC uTFLED exhibited an output power extraction efficiency...
The light enhancement of PhC LEDs within the collection cone angle was obtained according to measured far-field patterns. In a plusmn20deg collection cone, the collimated PhC LED was enhanced up to ~2.4.
Experimental investigation of A-type and B-type guided modes was performed in GaN-based film-transferred photonic crystal light-emitting diodes. Good agreement with the band structure calculated in the limit of two-dimensional free photon was obtained.
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