Improved Optical Efficiency of 850-nm Infrared Light-Emitting Diode with Reflective Transparent Structure

Author:

Lee Hyung-Joo1,Park Jin-Young2,Kwac Lee-Ku3,Lee Jongsu4ORCID

Affiliation:

1. CF Technical Division, AUK Corporation, Iksan 54630, Republic of Korea

2. Korea Photonic Technology Institute (KOPTI), Gwangju 61007, Republic of Korea

3. Department of Carbon Convergence Engineering, Jeonju University, Jeonju 55069, Republic of Korea

4. Department of Advanced Components and Materials Engineering, Sunchon National University, Suncheon 57922, Republic of Korea

Abstract

This study investigated a reflective transparent structure to improve the optical efficiency of 850 nm infrared light-emitting diodes (IR-LEDs), by effectively enhancing the number of extracted photons emitted from the active region. The reflective transparent structure was fabricated by combining transparent epitaxial and reflective bonding structures. The transparent epitaxial structure was grown by the liquid-phase epitaxy method, which efficiently extracted photons emitted from the active area in IR-LEDs, both in the vertical and horizontal directions. Furthermore, a reflective bonding structure was fabricated using an omnidirectional reflector and a eutectic metal, which efficiently reflected the photons emitted downwards from the active area in an upward direction. To evaluate reflective transparent IR-LED efficiency, a conventional absorbing substrate infrared light-emitting diode (AS IR-LED) and a transparent substrate infrared light-emitting diode (TS IR-LED) were fabricated, and their characteristics were analyzed. Based on the power–current (L-I) evaluation results, the output power (212 mW) of the 850 nm IR-LED with the reflective transparent structure increased by 76% and 26%, relative to those of the AS IR-LED (121 mW) and TS IR-LED (169 mW), respectively. Furthermore, the reflective transparent structure possesses both transparent and reflective properties, as confirmed by photometric and radial theta measurements. Therefore, light photons emitted from the active area of the 850 nm IR-LED were efficiently extracted upward and sideways, because of the reflective transparent structure.

Funder

“Regional Innovation Strategy (RIS)”

Ministry of Education

Basic Science Research Program

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Mechanical Engineering,Control and Systems Engineering

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