Efficiency droop suppression of distance-engineered surface plasmon-coupled photoluminescence in GaN-based quantum well LEDs | Zendy

Yufeng Li | Zendy; Shuai Wang | Zendy; Xilin Su | Zendy; Weihan Tang | Zendy; Qiang Li | Zendy; Maofeng Guo | Zendy; Ye Zhang | Zendy; Minyan Zhang | Zendy; Feng Yun | Zendy; Xun Hou | Zendy

Open Access

Efficiency droop suppression of distance-engineered surface plasmon-coupled photoluminescence in GaN-based quantum well LEDs

Author(s) -

Yufeng Li,

Shuai Wang,

Xilin Su,

Weihan Tang,

Qiang Li,

Maofeng Guo,

Ye Zhang,

Minyan Zhang,

Feng Yun,

Xun Hou

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4998217

Subject(s) - photoluminescence , materials science , voltage droop , surface plasmon , light emitting diode , optoelectronics , quantum efficiency , plasmon , spontaneous emission , coupling (piping) , quantum well , full width at half maximum , optics , voltage , physics , composite material , laser , quantum mechanics , voltage divider

Ag coated microgroove with extreme large aspect-ratio of 500:1 was fabricated on p-GaN capping layer to investigate the coupling behavior between quantum wells and surface plasmon in highly spatial resolution. Significant photoluminescence enhancement was observed when the distance between Ag film and QWs was reduced from 220 nm to about 20 nm. A maximum enhancement ratio of 18-fold was achieved at the groove bottom where the surface plasmonic coupling was considered the strongest. Such enhancement ratio was found highly affected by the excitation power density. It also shows high correlation to the internal quantum efficiency as a function of coupling effect and a maximum Purcell Factor of 1.75 was estimated at maximum coupling effect, which matches number calculated independently from the time-resolved photoluminescence measurement. With such Purcell Factor, the efficiency was greatly enhanced and the droop was significantly suppressed

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