TY - JOUR
T1 - Monolithic Red/Green/Blue Micro-LEDs with HBR and DBR Structures
AU - Chen, Guan Syun
AU - Wei, Bo Yu
AU - Lee, Ching Ting
AU - Lee, Hsin Ying
N1 - Funding Information:
Manuscript received October 13, 2017; revised December 1, 2017; accepted December 5, 2017. Date of publication December 25, 2017; date of current version January 8, 2018. This work was supported in part by the Ministry of Science and Technology, China under MOST 105-2221-E-006 -149-MY2 and in part by the Advanced Optoelectronic Technology Center, National Cheng Kung University, Taiwan. (Corresponding author: Hsin-Ying Lee.) G.-S. Chen, B.-Y. Wei, and H.-Y. Lee are with the Department of Photonics, National Cheng Kung University, Tainan 701, Taiwan (e-mail: hylee@ee.ncku.edu.tw).
PY - 2018/2/1
Y1 - 2018/2/1
N2 - In this letter, monolithic red, green, and blue (RGB) micro light-emitting diodes (LEDs) were fabricated using gallium nitride based blue micro LEDs and quantum dots (QDs). Red and green QDs were sprayed onto individual region surrounded by patterned black matrix photoresist on the blue micro LEDs to form color conversion layers. Owing to its light-blocking capability, the patterned black matrix photoresist improved the contrast ratio of the micro LEDs from 11 to 22. To enhance the color conversion efficiency and the light output intensity, a hybrid Bragg reflector (HBR) was deposited on the bottom side of the monolithic RGB micro LEDs, thus reflecting the RGB light emitted to the substrate. To further improve the color purity of the red and green light, a distributed Bragg reflector (DBR) with high reflection for the blue light was deposited on the top side of the QDs/micro LEDs. The red and green light output intensities of the micro LEDs with HBR and DBR were enhanced by about 27%.
AB - In this letter, monolithic red, green, and blue (RGB) micro light-emitting diodes (LEDs) were fabricated using gallium nitride based blue micro LEDs and quantum dots (QDs). Red and green QDs were sprayed onto individual region surrounded by patterned black matrix photoresist on the blue micro LEDs to form color conversion layers. Owing to its light-blocking capability, the patterned black matrix photoresist improved the contrast ratio of the micro LEDs from 11 to 22. To enhance the color conversion efficiency and the light output intensity, a hybrid Bragg reflector (HBR) was deposited on the bottom side of the monolithic RGB micro LEDs, thus reflecting the RGB light emitted to the substrate. To further improve the color purity of the red and green light, a distributed Bragg reflector (DBR) with high reflection for the blue light was deposited on the top side of the QDs/micro LEDs. The red and green light output intensities of the micro LEDs with HBR and DBR were enhanced by about 27%.
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U2 - 10.1109/LPT.2017.2786737
DO - 10.1109/LPT.2017.2786737
M3 - Article
AN - SCOPUS:85039768231
VL - 30
SP - 262
EP - 265
JO - IEEE Photonics Technology Letters
JF - IEEE Photonics Technology Letters
SN - 1041-1135
IS - 3
M1 - 8239685
ER -