Thomas Richard Cushman

60.1: Invited Paper: Tandem Hybrid White OLED Devices with Improved Light Extraction

A high-efficacy white OLED device is reported. At 1,000 cd/m2, the device showed an efficacy of 56 lm/W. The color at (0.387, 0.389) was within the Energy Star tolerance quadrangle; the CRI at 83.6 exceeded the requirements. The device had a tandem hybrid architecture comprising a fluorescent blue-emitting unit and a phosphorescent yellow-red-emitting unit. It also had an internal extraction enhancement structure that greatly enhanced the light extraction efficiency.

61.2: Fluorescent White OLED Devices with Improved Light Extraction

An all-fluorescent white OLED device with 14.5% external quantum efficiency and 31.2 lm/W efficacy has been demonstrated. The color coordinate at (0.387, 0.381) falls well within the DOE Energy Star tolerance quadrangle for 4000K CCT. The T50 lifetime is projected to be over 10,000 h at an initial brightness of 1,000 cd/m2. The performance is achieved through the use of improved OLED materials, improved architecture, as well as a light extraction structure that more than doubles the light extraction efficiency.

P-173: Reduction of Shorting Defects in OLED Devices

A method to reduce the detrimental effect of shorting defects in OLED devices is presented. The method involves the application of a transparent thin film of appropriate electrical resistance between two electrodes in order to divert the current away from the shorting defects.

10.1: Broadband-Emitting Microcavity-OLED Device

We demonstrate a broadband-emitting microcavity-OLED device by applying a light-scattering layer to a microcavity device to integrate its angular-dependent narrow-band emission and to detrap shorter wavelength light from the substrate. The luminous efficiency is improved, and the use of a thin metal film, in place of ITO, permits larger feature sizes and reduces device costs.