Abstract
We design a type of “tandem distributed Bragg reflector (DBR)” that shows advantages over normal DBR in ultraviolet region. We apply a tandem DBR centered at 390nm to a resonant cavity light emitting diodes model, consequently enhancing the extraction efficiency without detuning the cavity while narrowing the spectral width of the emitted light. The extraction efficiency into a numerical aperture exhibits a 36% increase compared to that of the normal structure. We further demonstrate the potential that the tandem DBRs (centered at 343nm and 246nm respectively) have for enhancing the efficiency in GaN-based deep UV device.
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