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Development of Efficient OLEDs from Solution Deposition
Published on: November 4, 2022
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Efficient fluorescent OLEDS based on assistant acceptor modulated HLCT emissive state for enhancing singlet exciton
Jayaraman Jayabharathi1, Jagathratchagan Anudeebhana1, Venugopal Thanikachalam1
1Department of Chemistry, Material Science Lab, Annamalai University Annamalai Nagar Tamilnadu-608 002 India jtchalam2005@yahoo.co.in.
RSC Advances
|May 2, 2022
Summary
New bipolar compounds, DDPPPA and DDPBA, function as efficient blue emitters in organic light-emitting diodes (OLEDs). Modifications enhanced thermal and photophysical properties, leading to high external quantum efficiencies in both non-doped and doped devices.
Area of Science:
- Materials Science
- Organic Electronics
- Photophysics
Background:
- Development of efficient and stable blue emitters is crucial for advanced organic light-emitting diodes (OLEDs).
- Donor-acceptor (D-A) architectures offer tunable electronic and optical properties for optoelectronic applications.
- Phenanthroimidazole derivatives have shown promise as functional materials in organic electronics.
Purpose of the Study:
- To synthesize novel phenylamine phenanthroimidazole-based bipolar compounds with a D-A architecture.
- To investigate the effect of pyrene moiety incorporation at C6 and C9 positions on material properties.
- To evaluate the performance of these compounds as blue emitters in non-doped and doped OLEDs.
Main Methods:
- Synthesis of two D-A compounds: DDPPPA and DDPBA, featuring pyrene units at C6 and C9 positions.
- Fabrication of non-doped and doped organic light-emitting diodes (OLEDs) utilizing DDPPPA and DDPBA as emissive layers.
- Characterization of thermal, photochemical, and electroluminescent properties, including external quantum efficiency (ηex), current efficiency (ηc), and power efficiency (ηp).
Main Results:
- The synthesized DDPPPA and DDPBA compounds exhibited enhanced thermal, photochemical, and electroluminescent properties due to C6/C9 pyrene modification.
- Non-doped OLEDs using DDPPPA/DDPBA achieved deep-blue emission with high efficiencies (ηex: 5.7-6.0%, ηc: 10.5-12.0 cd A⁻¹, ηp: 8.3-9.2 lm W⁻¹).
- High singlet exciton utilizing efficiencies (ηs) of 31.33% (DDPPPA) and 35.29% (DDPBA) were observed. Doped devices also showed competitive performance.
Conclusions:
- Phenylamine phenanthroimidazole derivatives with hybridized local and charge-transfer properties are effective deep-blue emitters for OLEDs.
- The strategic incorporation of pyrene moieties significantly improves the performance and stability of the organic emitters.
- These novel materials demonstrate potential for high-performance, energy-efficient blue organic light-emitting diode applications.
