Time-resolved electroluminescence studies of III-nitride ultraviolet photonic-crystal light-emitting diodes

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Abstract

The transient responses of III-nitride ultraviolet (UV) ionic-crystal light-emitting diodes (LED) were investigated using picosecond time-resolved electroluminescence (EL) spectroscopy. Triangular arrays of photonic crystals (PC) were fabricated on 333 nm UV LEDs for enhancing light extraction efficiency using electron-beam lithography and inductively coupled-plasma drying etching. The EL decay time constant decreased systematically with increase of etched sidewall area, which indicated strong effect of surface recombination. The results show that with increase in transient response along with enhanced light extraction, the incorporation of PCs in UV LEDs provide an effective method to control modulation speed of UV LEDs.

Original languageEnglish
Pages (from-to)2104-2106
Number of pages3
JournalApplied Physics Letters
Volume85
Issue number11
DOIs
StatePublished - Sep 13 2004

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