Fabrication of Electroluminescent Devices Using Nanocrystalline Oxide Phosphors
Nanosized Y2O3:Eu3+ crystalline powders with average particle sizes around 100 nm, measured by field-emission scanning electron microscopy (FE-SEM), have been synthesized by a polymerized precursor method using carboxymethyl cellulose (CMC). The nanocrystalline phosphors exhibit intense photoluminescence (PL) and cathodoluminescence (CL) around 612 nm, being attributed to the 5D0-7F2 transition of Eu3+. Electroluminescence (EL) properties of the nanophosphors in the form of thick films were investigated, and emission of red light with maximum intensity at 612 nm (corresponding to x = 0.57 and y = 0.32 in the CIE chromaticity diagram) was observed under high ac field at 1 kHz. The obtained results suggest a possibility that Y2O3:Eu3+ nanopowders can be used as a red-emitting phosphor for EL devices.
Kazumi Kato, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki
R. Fujiwara et al., "Fabrication of Electroluminescent Devices Using Nanocrystalline Oxide Phosphors", Key Engineering Materials, Vol. 388, pp. 123-126, 2009