Microstructure of ZnO fluorescents coated with SiO_2 particles were studied by transmission electron microscopy. Two different commercial ZnO fluorescents were studied in as-received condition. The sizes of each ZnO powder were roughly in the range of...
Microstructure of ZnO fluorescents coated with SiO_2 particles were studied by transmission electron microscopy. Two different commercial ZnO fluorescents were studied in as-received condition. The sizes of each ZnO powder were roughly in the range of 5-100㎛ in diameter. Both of the ZnO powders were coated with SiO_2 nano-size particles to prevent thermal decomposition during sintering of ZnO. TEM analysis showed the high dislocations density at the surface region of the ZnO powders. It identified the size and distribution of the nano-sized SiO_2 coated on the surface of ZnO, which will significantly degrade the fluorescent property.