Efficient Non-Doped White Organic Light-Emitting Diodes Based on an Interface Exciplex Structure
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Published on: November 15, 2016
Qing Zhao1, Ping Chen2, Tianyu Zhang1
1Key Laboratory of Geophysical Exploration Equipment, Ministry of Education, College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130012, China.
Abstract:
Non-doped organic light-emitting diodes (OLEDs) feature simple fabrication processes and favorable repeatability, yet their overall device performance remains unsatisfactory. Here we propose a novel white OLED based on ultrathin emissive layers (EMLs). The novel efficient device structure is constructed based on an interface exciplex structure. Color-stable or color-tunable white OLEDs can be realized by tuning the interlayer thickness. The resulting color-tunable white device obtains a maximum power efficiency of 32.03 lm/W with a correlated color temperature span from 4091 K to 5376 K. Furthermore, the luminescence mechanism is thoroughly investigated. The shift of the spectra in the color-tunable device is mainly attributed to the movement of the main exciton recombination zone.
