Chinese Optics Letters, Volume. 23, Issue 8, 082501(2025)
Size-dependent characteristics of GaN-based micro-LEDs for simultaneous display and wireless optical communication
Figures & Tables(9)
Fig. 1. Schematic structure of the epitaxial layers and the fabrication process of the micro-LED.
Fig. 2. Size-dependent characteristics of the injection current versus the voltage for (a) blue and (d) violet micro-LEDs. Size-dependent characteristics of the LOP versus the injection current for (b) blue and (e) violet micro-LEDs. Size-dependent characteristics of the EQE versus the current density for (c) blue and (f) violet micro-LEDs corresponding to the current densities from 1 to 300 A/cm2.
Fig. 3. Peak wavelength versus the current density semi-logarithmic coordinate curves for (a) blue and (c) violet micro-LEDs, and the FWHM versus the current density curves for (b) blue and (d) violet micro-LEDs corresponding to the current densities from 1 to 2400 A/cm2.
Fig. 4. Size-dependent EL emission images for (a) blue and (c) violet micro-LEDs corresponding to the current densities from 0.1 to 10 A/cm2. Chromaticity coordinates of (b) 80 µm blue and (d) 80 µm violet micro-LEDs in the CIE 1931 color space chromaticity diagram corresponding to the current densities from 1 to 2400 A/cm2.
Fig. 5. Normalized LOP versus the temperature curves for (a) 80 µm blue and (b) 80 µm violet micro-LEDs corresponding to the current densities from 10 to 2400 A/cm2.
Fig. 6. Size-dependent characteristics of -3 dB bandwidth versus the current density for (a) blue and (b) violet micro-LEDs corresponding to the current densities from 1 to 2400 A/cm2.
Fig. 7. BER versus the data rate of the VLC system with (a) 20 µm blue and (b) 20 µm violet micro-LEDs as transmitters. The eye diagrams were captured at the data rates of (c) 610 Mbps for 20 µm blue micro-LED and (d) 680 Mbps for 20 µm violet micro-LED.
Table 1. Key Metrics for Blue Micro-LEDs in VLC and Display Applications
View tableView in ArticleTable 1. Key Metrics for Blue Micro-LEDs in VLC and Display Applications
Parameter 10 µm 20 µm 40 µm 50 µm 60 µm 80 µm Light output power at 10 mA (µW) 80 231 327 394 494 630 Maximum external quantum efficiency (%) 1.57 1.73 2.01 2.28 2.56 3.5 Maximum modulation bandwidth (MHz) 360 332 283 258 229 163 Maximum data rate (Gbps) 0.890 1.032 0.799 0.741 0.616 0.580
Table 2. Key Metrics for Violet Micro-LEDs in VLC and Display Applications
View tableView in ArticleTable 2. Key Metrics for Violet Micro-LEDs in VLC and Display Applications
Parameter 10 µm 20 µm 40 µm 50 µm 60 µm 80 µm Light output power at 10 mA (µW) 753 867 1013 1109 1249 1347 Maximum external quantum efficiency (%) 2.43 3.49 3.76 3.98 4.29 4.52 Maximum modulation bandwidth (MHz) 336 313 228 203 185 168 Maximum data rate (Gbps) 1.095 1.347 0.856 0.782 0.768 0.694
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Yuhang Dai, Zhou Wang, Shiting Dou, Siqi Yang, Junyuan Chen, Haoxiang Zhu, Yan Gu, Jin Wang, Hao Zhang, Yi Liu, Qiang Chen, Xiaoyan Liu, "Size-dependent characteristics of GaN-based micro-LEDs for simultaneous display and wireless optical communication," Chin. Opt. Lett. 23, 082501 (2025)
Paper Information
Category: Optoelectronics
Received: Feb. 14, 2025
Accepted: Mar. 25, 2025
Posted: Mar. 25, 2025
Published Online: Jul. 15, 2025
The Author Email: Qiang Chen (20230222@njupt.edu.cn), Xiaoyan Liu (xiaoyanliu@njupt.edu.cn)
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