CHARACTERISTICS OF BaTiO₃-PVDF 0-3 COMPOSITE FILM FOR INORGANIC ELECTRO-LUMINESCENCE DEVICE

Abstract

In order to increase the brightness, the relative dielectric constant of the dielectric layer inserted between rear electrode and phosphor layer should be high. We manufactured BaTiO 3 -PVDF 0-3 type composite film for the application of the dielectric layer in the high brightness inorganic electro-luminescence (EL) device. The pastes for the BaTiO 3 -PVDF composite film were made with various mixing ratio by using 3-roll milling mixer. The pastes were coated on the phosphor layer by screen-printing method. The phosphor layer was also coated on a substrate by using the same screen-printing system. The substrate is an indium tin oxide (ITO) film deposited on PET (polyethylene terephthalate) polymer film. The others of rear electrode and insulating layer were also coated by the screen-printing method. Both the relative dielectric constant and the brightness of the fabricated EL device were increased with increasing the weight percent of BaTiO 3 dielectric material in the composite films. The brightness was also increased with decreasing the thickness of the dielectric layer. The brightness was enough to be applied to the backlight of the keypad in mobile phones.

X‐ray diffraction and differential scanning calorimetry studies of a BaTiO3/polyvinylidene fluoride composites

“…One of these polymer–ceramics composites is the barium titanate/polyvinylidene fluoride (BT) x (PVDF) 100– x series. These (BT) x (PVDF) 100– x series were successfully used as a dielectric layer inserted between rear electrode and phosphor layer in the high‐brightness inorganic EL device [2].…”

Low Driving Voltage Electroluminescence Device for Integrated Visual Strain Sensing

“…48 Besides, it is evident that reducing the thickness of the display layer effectively enhances the electric field and subsequently increases luminance. 31 Also in Figure 2d, we exhibit luminance data of devices with 35−50 μm thicknesses of display layer, and the thinner display layers yielded higher device luminances. However, it is noteworthy that decreasing the thickness of the display layer and excessive BTO doping would result in uneven film formation, leading to diminished display performance or device breakdown (see in Figure S5).…”

Multifunctional Displays and Sensing Platforms for the Future: A Review on Flexible Alternating Current Electroluminescence Devices

“…According to Chiang’s study, for a simple two-phase material in which the ferroelectric filler is well dispersed in a polymer matrix, the effective dielectric constant can be calculated from eq : where φ filler represents volume fraction of the filler in the composite, while ε filler and ε matrix are the dielectric constants of the filler and the polymer matrix, respectively. Therefore, a high- k material could be achieved by dispersing BaTiO 3 in the PVDF matrix, and the relative dielectric constant of the composite increased as the weight ratio of BaTiO 3 increased . This model can be extended to more composite materials.…”

“…Therefore, a high-k material could be achieved by dispersing BaTiO 3 in the PVDF matrix, and the relative dielectric constant of the composite increased as the weight ratio of BaTiO 3 increased. 91 This model can be extended to more composite materials.…”