Enhanced light collection of GaN light emitting devices by redirecting the lateral emission using nanorod reflectors.
We demonstrate a method of utilizing self-assembled nanorod array reflectors to collect the laterally propagating guided modes from a light emitting diode (LED). We measure an enhancement factor of 12.2% and 18.4%, respectively, from the sidewall emission of GaN-based LEDs encompassed with 10 and 20 microm thick nanorod array reflectors. Such enhancement is found to be omnidirectional due to a broken symmetry from a randomized distribution of the nanorod array placed along the periphery of the LED's mesa. These observations indicate that the use of nanorod reflectors can efficiently redirect the propagation of the laterally guided modes to the surface normal direction.
Cheng
Yun-Wei
YW
Graduate Institute of Photonics and Optoelectronics, National Taiwan University, 1, Roosevelt Road, Section 4, Taipei, 106, Taiwan.
Pan
Kun-Mao
KM
Wang
Cheng-Yin
CY
Chen
Hung-Hsien
HH
Ke
Min-Yung
MY
Chen
Cheng-Pin
CP
Hsieh
Min-Yann
MY
Wu
Han-Ming
HM
Peng
Lung-Han
LH
Huang
JianJang
J