Fabrication of Polystyrene/ZnO Micronano Hierarchical Structure Applied for Light Extraction of Light-Emitting Devices.
Polystyrene(PS)/ZnO micronano hierarchical structures were fabricated on a flat surface by depositing ZnO nanoparticles from a cluster beam at oblique incidence on the surface predeposited with PS microspheres. The hierarchical structure was composed of submicron-sized PS particle layers covered with dense films of columnar ZnO nanoparticle piles separated with nanoscale pores. It was demonstrated that the cooperative effect that combines the microlens function of the PS microspheres and the enhanced Rayleigh scattering of the ZnO nanoparticle porous layers can be used to greatly reduce the total internal reflection at the medium-air interface. The PS/ZnO hierarchical structures were fabricated on the surface of GaN-based light-emitting diode (LED) chips to enhance the light-extraction efficiency. A 77.7% improvement on the light-output power was realized, which was much greater than that obtained with the PS microstructures alone.
National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University , Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
Peng
P
Mao
National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University , Nanjing 210093, China.
Amulya krishna
Ak
Mahapatra
College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications , Nanjing 210046, China.
Jing
J
Chen
National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University , Nanjing 210093, China.
Minrui
M
Chen
National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University , Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
Guanghou
G
Wang
National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University , Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
Min
M
Han
ZnO nanoparticles; cluster beam; hierarchical structures; light extraction; light-emitting device