Investigations of Device Architectures of Organic Light-Emitting Devices for Displays and Lighting
Date Issued
2009
Date
2009
Author(s)
Chang, Chih-Hao
Abstract
In this thesis, we investigate several device architectures of organic light-emitting devices (OLEDs) to enhance the device performances for display and lighting applications. The first part of the thesis is discussing OLEDs for display applications. First, we focused on the true-blue phosphorescent OLEDs. Through careful architecture designs, true-blue phosphorescent OLEDs based on a series of true-blue iridium phosphors were developed. Then, we combined white OLEDs (WOLEDs) and pixilated microcavity structures to simplify the display manufacturing process and improve the color performances. The second part of the thesis is discussing WOLEDs for lighting applications. First, the multifunctional osmium complex was used to fabricate efficient all-phosphor doped WOLEDs with high color stability. Then, by utilizing the phosphorescent sensitization to fabricate WOLEDs, the common phenomenon of significant efficiency roll-off resulted from triplet-triplet annihilation in phosphorescent OLEDs could be mitigated. Finally, to attain the requirement of illumination, we focused on the improvement of color rendering ability of WOLEDs. Two types of WOLEDs were developed through employing the novel phosphors and device architecture designs. Within a wide luminance range, the Color Rendering Index (CRI) was maintained larger than 80 and 90 for two types WOLEDs, respectively.
Subjects
OLEDs
White OLEDs
Phosphorescent sensitization
microcavity
triplet-triplet annihilation
Color Rendering Index
Type
thesis
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