Issue 18, 2024

Robust luminogens as cutting-edge tools for efficient light emission in recent decades

Abstract

Blue luminogens play a vital role in white lighting and potential metal-free fluorescent materials and their high-lying excited states contribute to harvesting triplet excitons in devices. However, in TADF-OLEDs (ΔEST < 0.1 eV), although T1 excitons transfer to S1via RISC with 100% IQE, the longer lifetime of blue TADF suffers from efficiency roll-off (RO). In this case, hybridized local and charge transfer (HLCT) materials have attracted significant interest in lighting owing to their 100% hot exciton harvesting and enhanced efficiency. Both academics and industrialists widely use the HLCT strategy to improve the efficiency of fluorescent organic light-emitting diodes (FOLEDs) by harvesting dark triplet excitons through the RISC process. Aggregation-induced emissive materials (AIEgens) possess tight packing in the aggregation state, and twisted AIEgens with HLCT behaviour have a shortened conjugation length, inducing blue emission and making them suitable candidates for OLED applications. TTA-OLEDs are used in commercial BOLEDs because of their moderate efficiency and reasonable operation lifetime. In this review, we discuss the devices based on TTA fluorophores, TADF fluorophores, HLCT fluorophores, AIEgens and HLCT-sensitized fluorophores (HLCT-SF), which break through the statistical limitations.

Graphical abstract: Robust luminogens as cutting-edge tools for efficient light emission in recent decades

Article information

Article type
Review Article
Submitted
20 feb. 2024
Accepted
04 apr. 2024
First published
24 apr. 2024

Phys. Chem. Chem. Phys., 2024,26, 13561-13605

Robust luminogens as cutting-edge tools for efficient light emission in recent decades

J. Jayabharathi and V. Thanikachalam, Phys. Chem. Chem. Phys., 2024, 26, 13561 DOI: 10.1039/D4CP00737A

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