NEC invented transparent organic EL lighting panel

According to a report on March 11, NEC lighting company has developed an organic EL lighting panel as transparent as glass. The manufacturing process is transparent ITO (Indium tin oxide)Film to replace the aluminum electrode on the glass substrate. It is expected to be used in Windows that can show words, and it is planned to be commercialized after 2015. The organic EL lighting panel is generally an electrode that forms an ITO film on a glass substrate, and then forms a luminescent layer of organic material on it, followed by an aluminum electrode. ITO is also used for electrodes formed on organic materials by NEC illumination. Compared with aluminum electrodes formed by evaporation, ITO conductive films use sputtering technology, I . e. voltage is applied to the material to cause chemical reaction, and then only the required atoms are taken out. However, because sputtering is affected by defects and ultraviolet rays caused by atomic collisions, organic materials are prone to aging and light spots. NEC lighting has successfully established a manufacturing process to control the damage of organic materials to a small extent by adjusting the amount of gas and oxygen used in sputtering. The trial-produced organic EL lighting panel is a square with a side length of 20 cm and a transmittance of about 70. The luminous efficiency is 35 lumens per watt. In terms of life, the yellow bulb color is about 20 thousand hours. Adjust the ratio of red, green and blue on the luminous layer to freely change the color. The price of a square panel with a side length of 20 cm is planned to be controlled at around 10 thousand yen in 15 years. For Windows, light can be injected into the window at night like during the day for lighting. If used as a window, some windows can be illuminated and displayed at night. NEC lighting has won the comprehensive development agency of Japan's new energy industry technology (NEDO) The assistance is advancing the development of organic EL lighting.