Sung-Wen Huang Chen, Chih-Chiang Shen, Tingzhu Wu, Zhen-You Liao, Lee-Feng Chen, Jia-Rou Zhou, Chun-Fu Lee, Chih-Hao Lin, Chien-Chung Lin, Chin-Wei Sher, Po-Tsung Lee, An-Jye Tzou, Zhong Chen, Hao-Chung Kuo. Full-color monolithic hybrid quantum dot nanoring micro light-emitting diodes with improved efficiency using atomic layer deposition and nonradiative resonant energy transfer[J]. Photonics Research, 2019, 7(4): 416
- Photonics Research
- Vol. 7, Issue 4, 416 (2019)
Fig. 1. (a) Epitaxial wafer; (b) three subpixels of a green μLED, a blue NR-μLED, and a red QD-NR-μLED; (c) deposition of TCO film and pn electrodes; (d) covering DBR filter; (e) full-color display panel composed of the proposed hybrid QD-NR-μLEDs; (f) cross-sectional view of a single RGB pixel.
Fig. 2. (a) PL emission spectra of NR-μLEDs with and without ALD passivation; (b) TD-TRPL curves of NR-μLEDs with and without ALD passivation at 15 K and 300 K, respectively.
Fig. 3. (a) FLOM image of patterns printed by red QDs on a glass by using the latest SIJ printing system (the inset depicts minimum linewidth); (b) AFM image of deposited QDs.
Fig. 4. Absorption curve of red QDs and electroluminescence (EL) spectrum of blue NR-μLEDs (inset depicts a schematic configuration of spraying red QDs on blue NR-μLEDs using the SIJ printing system).
Fig. 5. (a) SEM image of RGB pixel array (top view); (b) SEM image of NR-μLED with 30° tilt angle; (c) TEM image of the contact area between MQWs and QDs; (d) TEM image of 1 nm Al 2 O 3
Fig. 6. (a) Without ALD passivation, TRPL curves of NR-μLEDs with and without red QDs; (b) with 1-nm ALD passivation, TRPL curves of NR-μLEDs with and without red QDs.
Fig. 7. Reflectance spectrum of the DBR.
Fig. 8. (a) EL spectra of RGB hybrid QD-NR-μLEDs; (b) color gamut of RGB hybrid QD-NR-μLEDs, NTSC, and Rec. 2020.
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