Center for Nanotechnology and Molecular Materials,Wake Forest University,Winston-Salem,NC 27109,USA;
Department of Physics,Wake Forest University,Winston-Salem,NC 27106,USA;
Key Laboratory of Luminescence and Optical Information(Ministry of Education),Institute of Optoelectronics Technology,Beijing Jiaotong University,100044 Beijing,P.R.China;
Department of Electro-Optics,School of Engineering,University of Dayton,Dayton,OH 45469,USA;
Department of Mathematics,Wake Forest University,Winston-Salem,NC 27106,USA;
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,201620 Shanghai,P.R.China;
College of Materials Science and Engineering,Donghua University,201620 Shanghai P.R.China;
Institute of Advanced Materials,Nanjing Tech University,211816 Nanjing,Jiangsu,P.R.China;
Department of Physics and Astronomy,College of Charleston,Charleston,SC 29424,USA;