A Colloidal-Quantum-Dot Integrated U-Shape Micro-Light-Emitting-Diode and Its Photonic Characteristics

Author:

Jao Yu-Ming1,Huang Bo-Ming1,Chang Ching1,Lin Fang-Zhong2,Lee Guan-Ying2,Huang Chung-Ping3,Kuo Hao-Chung45ORCID,Shih Min-Hsiung6,Lin Chien-Chung17

Affiliation:

1. Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan

2. Institute of Lighting and Energy Photonics, College of Photonics, National Yang Ming Chiao Tung University, Tainan City 71150, Taiwan

3. Graduate Program of College of Photonics, College of Photonics, National Yang Ming Chiao Tung University, Tainan City 71150, Taiwan

4. Department of Photonics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan

5. Semiconductor Research Center, Hon-Hai Research Institute, Taipei 114699, Taiwan

6. Research Center for Applied Sciences, Academia Sinica, Taipei 115201, Taiwan

7. Department of Electrical Engineering, National Taiwan University, Taipei 10617, Taiwan

Abstract

A special micro LED whose light emitting area is laid out in a U-like shape is fabricated and integrated with colloidal quantum dots (CQDs). An inkjet-type machine directly dispenses the CQD layer to the central courtyard-like area of this U-shape micro LED. The blue photons emitted by the U-shape mesa with InGaN/GaN quantum wells can excite the CQDs at the central courtyard area and be converted into green or red ones. The U-shape micro LEDs are coated with Al2O3 by an atomic layer deposition system and exhibit moderate external quantum efficiency (6.51% max.) and high surface recombination because of their long peripheries. Low-temperature measurement also confirms the recovery of the external quantum efficiency due to lower non-radiative recombination from the exposed surfaces. The color conversion efficiency brought by the CQD layer can be as high as 33.90%. A further continuous CQD aging test, which was evaluated by the strength of the CQD emission, under current densities of 100 A/cm2 and 200 A/cm2 injected into the micro LED, showed a lifetime extension of the unprotected CQD emission up to 1321 min in the U-shape device compared to a 39 min lifetime in the traditional case, where the same CQD layer was placed on the top surface of a squared LED.

Funder

National Science and Technology Council, Taiwan

Publisher

MDPI AG

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