Color tunable light-emitting diodes based on p+-Si/p-CuAlO2 /n-ZnO nanorod array heterojunctions

• Main Authors: Ling, Bo, Zhao, Jun Liang, Sun, Xiaowei, Tan, Swee Tiam, Kyaw, Aung Ko Ko, Divayana, Yoga, Dong, Zhili
• Other Authors: School of Materials Science & Engineering
• Format: Article
• Language: English
• Published: 2011
• Subjects: DRNTU::Engineering::Materials::Photonics and optoelectronics materials
• Online Access: https://hdl.handle.net/10356/96213; http://hdl.handle.net/10220/6866
• Institution: Nanyang Technological University

Wide-range color tuning from red to blue was achieved in phosphor-free p+-Si/p-CuAlO2/n-ZnO nanorod light-emitting diodes at room temperature. CuAlO2 films were deposited on p+-Si substrates by sputtering followed by annealing. ZnO nanorods were further grown on the annealed p+-Si/p-CuAlO2 substrates by vapor phase transport. The color of the p-CuAlO2/n-ZnO nanorod array heterojunction electroluminescence depended on the annealing temperature of the CuAlO2 film. With the increase of the annealing temperature from 900 to 1050 °C, the emission showed a blueshift under the same forward bias. The origin of the blueshift is related to the amount of Cu concentration diffused into ZnO.