Optical properties of inorganic powder EL device with a multifunctional dielectric layer

Abstract

Abstract In this paper, we report the optical properties of an inorganic powder electroluminescence (EL) device with a multifunctional dielectric layer. BaTiO3 doped with Yb3+ and Er3+ was used as a dielectric layer of an inorganic powder EL device. Also, BaTiO3 doped with Yb3+ and Er3+ can function as an upconversion phosphor. According to the luminance measurement, when near infrared (NIR) irradiation with 980 nm wavelengths was applied, the luminance was increased by only about 90 cd m−2. However, when both NIR irradiation and 150 root mean square voltages were applied, the luminance increased by about 400 cd m−2. Additionally, the emission spectrum and the chromaticity were changed. Therefore, BaTiO3: Yb3+, Er3+ plays two roles as a dielectric and phosphor simultaneously. The optical properties can also be manipulated by using BaTiO3: Yb3+, Er3+ as a dielectric layer of an inorganic powder EL device.