研究目的
To develop a simple fabrication method for a light extraction layer to improve the efficiency of white tandem organic light emitting diodes (WOLEDs).
研究成果
The fabricated WOLEDs with light extraction structures showed significant improvements in efficiency and color quality, achieving maximum EQEs of 103% and power efficiencies of 93.2 lm W?1. The method presents a simple and effective approach to enhancing WOLED performance.
研究不足
The study mentions concerns about voltage drop across thick transport layers and the potential for electrical degradation due to surface roughness.
1：Experimental Design and Method Selection:
The study employs a direct printing technique, nanoimprint lithography (NIL), to replicate a randomly arrayed nanopillar structure. This is followed by annealing to create a hollow structure in TiO
2：Sample Selection and Data Sources:
The samples include glass substrates patterned with PBMA and TiO2 layers.
3：List of Experimental Equipment and Materials:
Equipment includes a spin coater, annealing oven, and SEM for characterization. Materials include PBMA, TiO2 nanoparticles, and TiO2 sol.
4：Experimental Procedures and Operational Workflow:
The process involves NIL of PBMA, spin-coating of TiO2 nanoparticle dispersed resin and sol, and annealing to remove PBMA and form voids.
5：Data Analysis Methods:
The performance of WOLEDs is evaluated using current density-voltage-luminance measurements, EQE, and power efficiency calculations.
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