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White OLEDs (WOLEDTMs) fabricated using energy efficient phosphorescent OLED (PHOLEDTM) technology open up exciting new ways to develop efficient white lighting. WOLEDs have the potential to transform the lighting industry. In this presentation, phosphorescent WOLEDs with high conductivity transport layers will be discussed. White light can be generated by partial energy transfer from blue to green and red. Single WOLED stacks are demonstrated that match the Energy Star® lighting color criteria for 2700K and 3000K with high efficiency (˜80 lm/W) and high color rendering indices (˜80). Both devices had operational lifetimes (LT70%) over 30,000 hours measured from an initial luminance of 1,000 cd/m2. Different techniques to improve optical outcoupling will also be discussed.
The classical time-dependent drift-diffusion model for semiconductors is considered for small
scaled Debye length (which is a singular perturbation parameter). The corresponding limit is
carried out on both the dielectric relaxation time scale and the diffusion time scale. The latter
is a quasineutral limit, and the former can be interpreted as an initial time layer problem.
The main mathematical tool for the analytically rigorous singular perturbation theory of this
paper is the (physical) entropy of the system.
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