[1] Chinese Univ Hong Kong, Dept Informat Engn, Shatin, Hong Kong, Peoples R China
[2] Shenzhen Univ, Int Collaborat Lab Mat Optoelect Sci & Technol 2D, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov, Shenzhen, Peoples R China
[3] Tyndall Natl Inst, Cork, Ireland
[4] Univ Coll Cork, Cork, Ireland