Dai Nippon Printing (DNP) Co Ltd developed a light emitting material that can be printed on paper and cloth and used to make light emitting posters and POP materials, flexible displays, etc.
Desired patterns, such as characters and designs, can be printed with printing equipment using existing methods such as screen and offset printing, according to Dai Nippon Printing. The luminance of the new material is 200cd/m2 when a voltage of 3.3V is applied. The material can be driven with a dry cell battery because it emits light at a low voltage. The company intends to commercialize the material in the next five years.
The new light emitting material has three main components, which are a metal compound serving as a luminous body, an electrolyte and silica nanoparticles. The metal compound is a transition metal complex composed mainly of ruthenium and can provide a high luminance.
An ionic liquid is used as the electrolyte. Because ionic liquid does not evaporate, the light emitting material printed on a desired medium can emit light in the atmosphere without sealing it in glass or films, according to Dai Nippon Printing.
The silica nanoparticles are used to gelate the light emitting material. By gelating the material, patterns can be printed on paper, cloth, etc just like ink, the company said.
Light emission occurs with a 25μm or thicker film. Compared with OLEDs, which use films with a thickness of about several dozen nanometers, it is less affected by contamination by foreign matter, eliminating the need for a clean room or other special equipment or environments, according to the company.
Dai Nippon Printing plans to explain the technology at the 76th Meeting of the Electrochemical Society of Japan, which is currently taking place at Kyoto University.
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