| Affiliation: | 1. Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong SAR, P. R. China;2. Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Science, Beijing Jiaotong University, Beijing, P. R. China;3. Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA;4. Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland |
