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Adjustable surface plasmon-polariton resonance in OLED devices based on corrugated alloy electrodes

Adjustable SPP resonance of the OLED based on the corrugated alloy electrode. Credit: Compuscript Ltd

With a new publication from Advances in optoelectronicsResearchers led by Professor Yan-Gang Bi of Jilin University in Changchun, China, are discussing the adjustable surface plasmon-polarization resonance of organic light-emitting devices based on corrugated alloy electrodes.

Organic light emitting devices (OLEDs) offer a wide selection of materials, wide spectrum, high brightness, thin wall, wide viewing angle, excellent transparency and flexibility. As a result, they became the focus of research interest and demonstrated potential applications for flexible and stretchable equipment. Almost 100% of the internal quantum efficiency is achieved with phosphorescent OLEDs, but many photons generated in the active layer are trapped and lost in the OLED. NS Power loss For OLEDs, it comes from substrate mode, waveguide mode, surface plasmon-polariton (SPP) mode, and so on. A periodic waveform is used to excite the SPP. resonance, And corrugated metal electrodes can extract photons trapped by the SPP mode of the OLED. Waveform period is an important factor in exciting SPP resonance at the desired emission wavelength in various OLEDs. 2 beam interference lithography, Nanoimprint lithography (NIL), Electron beam lithography, And Focused Ion Beam Lithography are common techniques for producing periodic waveforms. However, in costly and complex manufacturing processes Commercial application Get waveforms with different periods on different OLEDs.

The wavelength of the excited SPP resonance can also be changed by the material properties of the metal / dielectric interface. In this article, the authors report a viable method for achieving OLED-tunable SPP resonance by using corrugated Ag-Al alloy electrodes. The excited SPP resonance caused by the periodic waveform was precisely adjusted based on the composition ratio of the Ag-Al alloy electrodes. With the proper composition ratio of the corrugated alloy electrode, the photons trapped in SPP mode were recovered and effectively extracted. By using corrugated Ag-Al alloy electrodes for the OLED, the brightness is improved by 25% and the current efficiency is improved by 21%. FloridaNewsTimes

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