OLED-TV Display/Monitor Technology News

Cambridge Display Technology (CDT) and Sumation have announced improved results for green and blue polymer OLED materials.

“Data from spin coated devices using a common cathode and a recently developed solution processable green P-OLED material demonstrate lifetimes to half brightness of 50,000 hours from an initial luminance of 1,000cd/m sq,” said the firm. “This is equivalent to over 285,000 hours from an operating brightness of 400cd/m sq.”
Recent blue materials are showing 10,000 hours of life from 1,000cd/m sq - estimated to be 62,000 hours from 400cd/m sq.

The new blues are also deeper in colour. “CIE chromaticity coordinates for previously reported blues were x=0.14, y=0.21,” said CDT, “whereas the latest materials are much deeper: x=0.14, y=0.19.”

Thermal lifetime acceleration factors for OLEDs, based on long educated guesswork by academics, are being refined by experience.

“Factors to convert lifetime from one brightness to another have been determined for green and blue materials using various initial luminances between 800 and 6,000cd/m sq,and found to be equal to 1.9 for green and 2 for blue,” said CDT.