Dainippon Printing develops luminous materials that can be printed on paper and cloth

Dainippon Printing has developed luminescent materials that can be printed on paper and cloth. In addition to luminescent posters and POPs, it can also be used for flexible displays and the like. With the use of existing printing equipment such as screen printing and offset printing, it is possible to print arbitrary shapes of characters and designs. The luminance was 200 cd/m2 when a voltage of 3.3 V was applied. Because it is a low-voltage light, you can drive with a dry battery. It is expected to be listed after 5 years.

This luminescent material is substantially composed of a metal compound that forms a light emitter, an electrolyte, and silica nanoparticles. The metal compound is a ruthenium-centered transition metal complex and can obtain higher brightness. The electrolyte uses ionic liquids. Ionic liquids do not evaporate, so printed luminescent materials do not require glass and thin-film encapsulation and can emit light directly in the atmosphere. Silica nanoparticles are used to form a luminescent material into a gel. The luminescent material is made into a gel and can be printed on paper, cloth or the like like ink.

The material emits light from a thicker film above 25 μm. Compared to organic ELs, which use thin films with a thickness of several tens of nanometers, it is less likely to be affected by the presence of foreign matter, and there is no need for a clean room or other equipment environment.

The technology will be announced at the Electrochemical Society held by Kyoto University.