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Progress in small-molecule luminescent materials for organic light-emitting diodes

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  • Special Topic Advances in Organic Optoelectronic Molecules & Materials
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Abstract

Organic light-emitting diodes (OLEDs) have been extensively studied since the first efficient device based on small molecular luminescent materials was reported by Tang. Organic electroluminescent material, one of the centerpieces of OLEDs, has been the focus of studies by many material scientists. To obtain high luminosity and to keep material costs low, a few remarkable design concepts have been developed. Aggregation-induced emission (AIE) materials were invented to overcome the common fluorescence-quenching problem, and cross-dipole stacking of fluorescent molecules was shown to be an effective method to get high solid-state luminescence. To exceed the limit of internal quantum efficiency of conventional fluorescent materials, phosphorescent materials were successfully applied in highly efficient electroluminescent devices. Most recently, delayed fluorescent materials via reverse-intersystem crossing (RISC) from triplet to singlet and the “hot exciton” materials based on hybridized local and charge-transfer (HLCT) states were developed to be a new generation of low-cost luminescent materials as efficient as phosphorescent materials. In terms of the device-fabrication process, solution-processible small molecular luminescent materials possess the advantages of high purity (vs. polymers) and low procession cost (vs. vacuum deposition), which are garnering them increasing attention. Herein, we review the progress of the development of small-molecule luminescent materials with different design concepts and features, and also briefly examine future development tendencies of luminescent materials.

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Authors and Affiliations

  1. State Key Laboratory of Luminescent Materials and Devices; Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou, 510640, China

    Tiancheng Yu, Linlin Liu, Zengqi Xie & Yuguang Ma

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  1. Tiancheng Yu
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  2. Linlin Liu
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  3. Zengqi Xie
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  4. Yuguang Ma
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Correspondence to Zengqi Xie or Yuguang Ma.

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Yu, T., Liu, L., Xie, Z. et al. Progress in small-molecule luminescent materials for organic light-emitting diodes. Sci. China Chem. 58, 907–915 (2015). https://doi.org/10.1007/s11426-015-5409-7

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  • DOI: https://doi.org/10.1007/s11426-015-5409-7

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