Emission of dispersed‐type inorganic EL devices with frequency‐variable high‐voltage oscillation circuit

Abstract

Dispersed‐type inorganic electroluminescent (EL) devices composed of a transparent electrode, a phosphor, a dielectric, and a back electrode were prepared under various conditions using a zinc sulfide (ZnS)‐based phosphor. Additionally, a voltage/frequency variable circuit was designed. A compact high‐voltage/frequency variable circuit including three modules for boosting, frequency conversion, and voltage conversion was designed. A 140 Vpp voltage and a frequency in the range of 270 Hz to 2.4 kHz can be controlled by this circuit. The emission has begun to be observed at a voltage about 60 Vpp and a frequency of 400 Hz, at a voltage about 40 Vpp and a frequency of 1.4 kHz, 2.4 kHz, respectively. The emission intensity increased with an increase in frequency; emission with a wavelength of 450 nm was strongly influenced by the frequency. The luminescence and the electrical properties were affected by the preparation conditions including device structures, dispersion of ZnS:Cu, and Cl particles because of the current path generated by defects in the EL cell.

Highly conductive carbon-based aqueous inks toward electroluminescent devices, printed capacitive sensors and flexible wearable electronics

“…Compared to the traditional industrial production of EL devices using silver paste as a back electrode, we demonstrate the use of HCCA-inks as the back electrode to produce EL devices, reducing costs and reducing environmental pollution. 40 Capacitance sensor performance analysis A proximity type capacitive sensing chip MTCH112 (ref. 34 and 41) was used to build a capacitive sensor with the HCCA-inks.…”

Effect of inductor types and shapes on the characteristics of an inorganic EL driven by wireless power transfer

“…In this study, an additional film capacitor C 2 was connected in parallel to the EL so that the resonance frequency settles within a desirable range to drive the EL (1-3 kHz). 24) As a result, the experimental circuit consists of minimal components as shown in Fig. 1.…”

Effects of Polymer Gel Electrolyte on Photoelectric Properties and Driving Characteristics of Prussian-Blue-Based Electrochromic Cells in Automatic Driving Circuit

“…9 and conducted the experiment of driving the EC cell. In contrast to the driving circuit of the inorganic EL of the previous report, we fabricated the simply ON/OFF switching circuit [19]. The input signal was controlled via PIC Microcontroller 12F629, and the program was written such that the signal oscillated alternately from the two terminals every 3 s. Thereafter, a current was applied to the coil via a transistor.…”