Coupled Electric-optical Model for High Efficiency Waveguide-coupled Colloidal Quantum Dot Light-emitting Diodes

Jieyu Tan1; Hechun Zhang1; Ruitao Zheng1; Xiangtian Xiao2; Jing Tan1; Kai Wang3; Dan Wu1

10.1109/ICET61945.2024.10673136

2024-05-20

2768-6493

979-8-3503-6396-8

2024 7th International Conference on Electronics Technology (ICET)

17-20 May 2024

Chengdu, China

As a promising candidate for the new generation of light sources, quantum dot light-emitting diodes (QLEDs), relying on the electroluminescence of colloidal quantum dots (CQDs), have great potential in applications of on-chip silicon photonics. In this study, a coupled electric-optical model is constructed to investigate the drift and diffusion of carriers and distributions of radiation from QDs coupled to silicon nitride (SiN) waveguides (W-QLEDs) on silicon substrate to form direct on-chip light sources. The electric-optical characteristics of regular and inverted W-QLEDs, such as electroluminescence intensity, recombination rate, charge density and current density, were simulated and analyzed systematically. Based on these, the thicknesses of the QDs active layer and transport layers in different structured W-QLEDs are co-optimized to improve the coupled efficiency of the devices. After coupled electric-optical optimization, the regular and inverted W-QLEDs demonstrate maximal coupled efficiencies of $\mathbf{9. 0 0 \%}$ and $\mathbf{1 7. 0 7 \%}$ respectively which is at least one order of magnitude higher than the reported value. This study provides theoretical guidance for future development of high-efficiency waveguide-coupled direct on-chip light sources on silicon and will demonstrate great potential in the on-chip sensing, near-eye display applications.

其他

1.College of New Materials and New Energies, Shenzhen Technology University, Shenzhen, China
2.School of Physics and Optoelectronic Engineering Guangdong Provincial Key Laboratory of Sensing Physics and System Integration Applications, Guangdong University of Technology, Guangzhou, China
3.Department of Electronic and Electrical Engineering, Southern University of Science and Technology, Shenzhen, China

Jieyu Tan,Hechun Zhang,Ruitao Zheng,et al. Coupled Electric-optical Model for High Efficiency Waveguide-coupled Colloidal Quantum Dot Light-emitting Diodes[C],2024.