研究目的
To develop and optimize flexible and large-area red OLEDs using a roll-to-roll compatible process, focusing on the interlayer engineering to enhance device performance.
研究成果
The optimized OLEDs demonstrated good performance with a turn-on voltage of 2.8 V, EQE of 0.11%, PE of 0.291 lm/W, and luminescence of 303 cd/m2 at 8.0 V. The use of PVK and ZnO interlayers significantly improved device performance, making the fabricated OLEDs suitable for large-area, flexible lighting solutions.
研究不足
The study acknowledges the challenges in achieving uniform multilayer devices through solution processing, including ink formulations, coating methods, and parameters. The performance of slot-die-coated devices often lags behind those fabricated using evaporation methods due to film and layer uniformity issues.
1：Experimental Design and Method Selection:
The study focused on optimizing the ink formulations and coating parameters for each layer of the OLED structure (PET/ITO/PEDOT:PSS/PVK/PFO:tPDI2N-EH/ZnO/Ag) using slot-die-coating in ambient air.
2：Sample Selection and Data Sources:
Flexible PET/ITO substrates were used as the base. The materials included PVK, PEDOT:PSS, PFO, tPDI2N-EH, and ZnO nanoparticles.
3：List of Experimental Equipment and Materials:
A commercially available slot-die coater (Ossila Ltd.), Keithley 2612B source measure unit, 818-SL/DB Si photodetector, TT2-AFM, Cary 60 UV?vis Spectrometer, Cary Eclipse Fluorescence Spectrometer, and a Markforged 3D printer for mask design.
4：Experimental Procedures and Operational Workflow:
The layers were sequentially coated on PET/ITO substrates, with each layer's coating parameters optimized for uniformity and performance. The Ag cathode was thermally deposited under vacuum.
5：Data Analysis Methods:
Performance metrics such as turn-on voltage, luminescence, current efficiency, power efficiency, and EQE were measured. AFM was used for surface roughness analysis.
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Cary 60 UV?vis Spectrometer
Cary 60
Agilent Technologies
Optical absorption spectra recording
Cary 60 UV-Vis Spectrophotometer
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Cary Eclipse Fluorescence Spectrometer
Cary Eclipse
Agilent Technologies
Photoluminescent spectra recording
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Keithley 2612B
2612B
Keithley
Source measure unit for J?V characteristics measurement
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818-SL/DB Si photodetector
818-SL/DB
Newport
Recording output power
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TT2-AFM
TT2-AFM
AFM Workshop
Atomic force microscopy imaging
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Markforged 3D printer
Onyx One
Markforged
Designing the optimal mask for Ag deposition
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