The flat LED lighting panel of the ROHM color rendering LED package was exhibited at the CEATEC JAPAN 2012 held at the MESEE International Convention and Exhibition Center in Makuhari from October 2nd to 6th. The panel covers the LEDs arranged on the plane with a light diffusing plate, and realizes surface light emission like organic EL illumination. It is characterized by a high color rendering property of an average color rendering index (Ra) of 98, and also prevents a lead frame vulcanization phenomenon which causes a decrease in color rendering.
In the LED package, the silver plating layer on the lead frame of the LED chip usually reacts (vulcanizes) with the hydrogen sulfide in the air intruded through the sealing material to become black, thereby causing a gradual decrease in color rendering. The LED package developed by ROHM prevents vulcanization by providing a white resin layer that reflects light between the sealing material and the lead frame, thereby suppressing the decrease in color rendering. In addition, the heat resistance is also improved, and the life at 110 ° C reaches 50,000 hours (the time when the luminous flux is reduced to 70%). This lighting panel uses a special LED, although the luminous efficiency has not been announced, but Rom said that "cost and luminous efficiency are better than organic EL lighting."
In the LED package, the silver plating layer on the lead frame of the LED chip usually reacts (vulcanizes) with the hydrogen sulfide in the air intruded through the sealing material to become black, thereby causing a gradual decrease in color rendering. The LED package developed by ROHM prevents vulcanization by providing a white resin layer that reflects light between the sealing material and the lead frame, thereby suppressing the decrease in color rendering. In addition, the heat resistance is also improved, and the life at 110 ° C reaches 50,000 hours (the time when the luminous flux is reduced to 70%). This lighting panel uses a special LED, although the luminous efficiency has not been announced, but Rom said that "cost and luminous efficiency are better than organic EL lighting."
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