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[Multiple emissions in organic electroluminescent device using a mixed layer as an emitter].
Wen-qing Zhu1, You-zhi Wu, Xin-you Zheng
1Department of Materials, Shanghai University, Shanghai, China.
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|August 16, 2005
Summary
This study demonstrates a novel organic electroluminescent device using a mixed emitter layer. The device exhibits tunable emission colors through exciplex and electroplex formation, offering an effective method for color tuning in organic electronics.
Area of Science:
- Organic electronics
- Materials science
- Photophysics
Context:
- Organic electroluminescent devices (OLEDs) are crucial for displays and lighting.
- Controlling emission color in OLEDs is essential for device performance.
- Mixed emitter layers offer potential for novel optical properties.
Purpose:
- To fabricate and characterize an organic electroluminescent device using a mixed emitter layer.
- To investigate the emission mechanisms, including monomer, exciplex, and electroplex contributions.
- To explore the effect of electric field on emission spectra and color tuning.
Summary:
- An organic electroluminescent device was fabricated using a mixed layer of N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD) and 2-(4'-biphenyl)-5-(4''-tert-butylphenyl)-1,3,4-oxadiazole) (PBD).
- Electroluminescent spectra revealed simultaneous monomer, exciplex, and electroplex emissions, attributed to interactions between TPD and PBD.
- The device exhibited a maximum luminance of 240 cd/cm² and external quantum efficiency of 0.49%, with emission color tunable by electric field strength.
Impact:
- Demonstrates a method for tuning emission color in OLEDs through exciplex and electroplex formation.
- Highlights the role of intermolecular interactions in mixed emitter systems for optical properties.
- Provides insights into the fundamental mechanisms governing light emission in organic solid-state devices.