Short-Wavelength Organic Light-Emitting Materials and Devices
Date Issued
2005
Date
2005
Author(s)
Lin, Yu-Ting
DOI
zh-TW
Abstract
Organic light-emitting devices (OLEDs) have been the subjects of intense investigation in recent years due to their applications in displays and lighting. In all these applications, the short-wavelength emitting materials and devices with high efficiency, good color purity and thermal stability have been essential. In this thesis, we investigate of various device architectures to study the optical and electrical properties of the short-wavelength emitting materials.
In the first part of the work, we employed an efficient and morphologically stable pyrimidine-containing spirobifluorene-cored oligoaryl, as a blue emitter or emitting host for blue OLEDs. These devices exhibit unique endurance for high currents, leading to a very high brightness under dc driving.
In the second part of the work, we investigate various device architectures of OLEDs incorporating highly efficient blue-emitting and ambipolar carrier-transport ter(9,9-diarylfluorene)s, and their influences on device characteristics. Using the double heterostructure that provides effective double confinement on both carriers and excitons, results in a high EL external quantum efficiency, low-voltage, and very saturated blue emission without doping the emitting layer.
Finally, we studied a series of UV emitter based on ambipolar carrier-transport bi(9,9-diaryfluorene)s that exhibited promising physical properties including high morphological and thermal stability, and high neat-film quantum yields for UV emission. The UV OLEDs using the double heterostructure can exhibit high EL external quantum efficiency, low device voltage, and UV emission without emissive dopants.
Subjects
短波長
有機發光元件
發光材料
發光元件
organic
short wavelength
light emitting devices
light emitting materials
Type
thesis
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