Dual-band light-emitting diode based on microwheel cavity Gangyi Zhu, Mengyao Zhou, Siqing He, Feifei Qin, Boning Han, Yan Jiang, Xin Li, Haibo Zeng and Yongjin Wang EPL, 128 5 (2019) 58002 Published online: 03 February 2020 DOI: 10.1209/0295-5075/128/58002