16. Design Considerations for OLED Lighting

Abstract

Most commercial organic light-emitting diodes (OLED) activity throughout history has focused on displays. Lighting is a relatively new application and focus, which requires different considerations in the device design. First of all, in lighting, color is critical. Most OLED displays use single color pixels to form full color devices and these devices have been commercialized in cells phones and other small devices, and are in the early stages of commercialization for televisions. For general lighting applications, white light is required. There is a strict definition of what constitutes white light and there are stringent requirements regarding its chromaticity, color-rendering ability, color uniformity over angle, and color consistency over lifetime, among other criteria. These color requirements have a very significant impact on OLED device design. The second crucial consideration in device design for OLED lighting is efficacy. It is the key reason for our interest in OLED lighting, and a larger concern in lighting than in displays. OLEDs need to compete against not just incandescent lamps, but also fluorescent Ch ap te r 16 16. Design Considerations for OLED Lighting