A group of researchers from the Kanazawa Institute of Technology in Japan suc­ceeded in devel­op­ing a green phosphor-based OLED. What’s the big deal? The light-emitting effi­ciency they achieved with this new OLED was 210lm/W (that’s lumens per watt) at 10 cd/m2 (or nits) of lumi­nance. That num­ber is almost a 57% improve­ment over exist­ing OLEDs.

Based on a bottom-emission type using a 0.7mm glass plate, the light-emitting layer is made up of a host mate­r­ial called “CBP”. An irid­ium com­plex is added to it and peak emis­sion wave­lengths are between 500 and 550nm, cor­re­spond­ing to the green color.

Without the 0.7mm glass plate that is highly refrac­tive the light-emitting effi­ciency was only 93.3lm/W. The researchers con­cluded that the glass plate was respon­si­ble for more than dou­bling the light extrac­tion efficiency.

Source: TechOn, OLED-Info