The advent of GaN and its alloys has revolutionized the field of lighting. However, owing to the associated high-cost materials and vacuum-based processes, alternatives to GaN are being researched. Among recently emerging light-emitting diode (LED) materials, γ-phase cuprous iodide (γ-CuI) exhibits remarkable potential because of its wide direct bandgap (2.95 eV) and high exciton binding energy (62 meV). In this study, we fabricated violet LEDs composed of n-Mg0.027Zn0.973O quantum dots and p-Cu1-xZnxI thin films. To enhance the device performance, a quasi-double heterostructure, which is a slightly modified double heterostructure, was designed. Simple thermal diffusion of Zn and Cu iodination processes were used to realize this structure, and the LED fabricated in this manner exhibited approximately 10-fold stronger luminescence than the LED with the pristine p-CuI thin film.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (NRF-2018M3D1A1058793).
© 2020 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering