Simulation of enhanced light extraction from periodic, disordered, and quasi-periodic OLED structures
- Iowa State University, Ames, IA (United States)
- Ames Laboratory, and Iowa State University, Ames, IA (United States)
We have developed a rigorous scattering matrix theory of light emission from periodically structured media using a Green’s function approach. We computationally simulate the spectral power inside the structure, incorporating Purcell factor enhancements, and find internal waveguiding modes and plasmonic losses. We simulate the light-outcoupling factor and describe how corrugations and structured media can enhance . We have extended our framework to describe non-periodic disordered arrays as well as aperiodic quasi-crystalline arrays. Flat organic light-emitting diodes (OLEDs) have low outcoupling with since most of the light is trapped in waveguided modes in higher index layers or lost to plasmonic excitations at the metal cathode. Periodically corrugated OLEDs can achieve highly enhanced for pitch values between 1000 and 2000 nm, representing an enhancement factor over planar structures. Periodic corrugations strongly diffract trapped waveguided and plasmonic modes to the emissive air cone. Disordered templates also can cause significant enhanced outcoupling with for smaller nearest-neighbor separations of 300–400 nm. Quasi-crystalline tilings can also lead to enhancements of . This framework can be utilized to design novel structured media that can generate high light extraction.
- Research Organization:
- Iowa State Univ., Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- Grant/Contract Number:
- EE0007621; EE0008724; AC02-05CH11231
- OSTI ID:
- 1848537
- Alternate ID(s):
- OSTI ID: 1812245; OSTI ID: 1812246
- Journal Information:
- Journal of the Optical Society of America. Part B, Optical Physics, Vol. 38, Issue 9; ISSN 0740-3224
- Publisher:
- Optical Society of America (OSA)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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