Light extraction efficiency enhancement of InGaN quantum wells light-emitting diodes with polydimethylsiloxane concave microstructures | Zendy

YikKhoon Ee | Zendy; Pisist Kumnorkaew | Zendy; Ronald A. Arif | Zendy; Hua Tong | Zendy; James F. Gilchrist | Zendy; Nelson Tansu | Zendy

Open Access

Light extraction efficiency enhancement of InGaN quantum wells light-emitting diodes with polydimethylsiloxane concave microstructures

Author(s) -

YikKhoon Ee,

Pisist Kumnorkaew,

Ronald A. Arif,

Hua Tong,

James F. Gilchrist,

Nelson Tansu

Publication year - 2009

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.17.013747

Subject(s) - materials science , polydimethylsiloxane , light emitting diode , microstructure , quantum efficiency , optoelectronics , optics , diode , extraction (chemistry) , composite material , physics , chemistry , chromatography

Improvement of light extraction efficiency of InGaN light emitting diodes (LEDs) using polydimethylsiloxane (PDMS) concave microstructures arrays was demonstrated. The size effect of the concave microstructures on the light extraction efficiency of III-Nitride LEDs was studied. Depending on the size of the concave microstructures, ray tracing simulations show that the use of PDMS concave microstructures arrays can lead to increase in light extraction efficiency of InGaN LEDs by 1.5 to 2.0 times. Experiments utilizing 2.0 micron thick PDMS with 1.0 micron diameter of the PDMS concave microstructures arrays demonstrated 1.70 times improvement in light extraction efficiency, which is consistent with improvement of 1.77 times predicted from simulation. The enhancement in light extraction efficiency is attributed to increase in effective photon escape cone due to PDMS concave microstructures arrays.

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