Cambridge Display Technology and Sumation are pleased to announce new and improved results for green and blue PLED materials.
Data from spin coated devices using a common cathode and a recently developed solution processable green PLED material demonstrate lifetimes(1) of 50,000 hours from an initial luminance of 1000 candelas per square meter, or cd/sq.m. This is equivalent(2) to over 285,000 hours from an operating brightness of 400cd/sq.m for this material and represents a 40% increase in lifetime compared to results announced on March 27, 2007.
Blue materials have now been developed with a demonstrated lifetime(1) of 10,000 hours from an initial luminance of 1000 cd/m2 (or 62,000 hours from an operating brightness of 400 cd/m2) and a deeper color. CIE chromaticity coordinates for previously reported blues were x=0.14, y=0.21, whereas the latest materials are much deeper (x=0.14, y=0.19). Developing red, green and blue materials with the right color point is particularly important for full color display applications from which richness of color is increasingly being expected and demanded by consumers.