Understanding of Degradation Mechanism by Exciton Dynamics and Enhancement of Operational Lifetime by Exciton Management in Blue Fluorescent OLEDs Based on Hybridized Local and Charge-Transfer Molecule

Article Chemistry, Multidisciplinary

Breaking the Efficiency Limit of Deep-Blue Fluorescent OLEDs Based on Anthracene Derivatives

Hyoungcheol Lim et al.

Summary: This study demonstrates the realization of a radiative singlet-exciton ratio of nearly 25% through triplet-triplet annihilation (TTA) using an anthracene derivative, breaking the theoretical maximum limit for blue-emitting compounds. The developed deep-blue TTA fluorescent devices exhibit external quantum efficiencies of 10.2% and 8.6%, with the radiative singlet ratio generated from TTA reaching 37.5%, well above the previously known limit of 15%. The theoretical model provided in the study explains the experimental results comprehensively, indicating the potential development of highly efficient OLEDs with external quantum efficiencies exceeding 28% by maximizing outcoupling efficiency.

ADVANCED MATERIALS (2022)

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Review Chemistry, Multidisciplinary

A Brief History of OLEDs-Emitter Development and Industry Milestones

Gloria Hong et al.

Summary: Organic light-emitting diodes (OLEDs) have undergone significant development over the past 30 years, with advancements in emitter materials leading to three generations of OLED devices. Research is now focused on the fourth generation of OLEDs, with academia and industry achieving milestones in the development of green, orange-red, and blue OLED emitters.

ADVANCED MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Efficiency Breakthrough of Fluorescence OLEDs by the Strategic Management of Hot Excitons at Highly Lying Excitation Triplet Energy Levels

Chengwei Lin et al.

Summary: The study investigates the hot exciton process between high-lying triplet state and lowest excited singlet state in AIE material TPB-PAPC and demonstrates the improvement in efficiency with Forster resonance energy transfer. Doping a blue fluorescent emitter aids in inhibiting losses and achieving high EQE in blue OLEDs, both in AIE and HLCT materials, leading to efficiency breakthroughs in blue fluorescence OLEDs.

ADVANCED FUNCTIONAL MATERIALS (2021)

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Article Chemistry, Multidisciplinary