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Achieving highly-efficient room-temperature phosphorescence with a nylon matrix

Dian-Xue Ma, Yu-Wu Zhong*

https://doi.org/10.1016/j.cjsc.2024.100391

ABSTRACT

In summary, we provide a perspective herein on the use of nylons as a potential matrix for small molecular phosphors to achieve highly-efficient RTP performance. A number of polymers to date have been developed as effective phosphor matrices, including PMMA, PVA, PAN, and PS. However, it remains a challenge to obtain RTP performance with both high phosphorescence quantum yield and long phosphorescence lifetime. Nylon polymers provide a potential candidate to achieve this goal, as demonstrated by the successful fabrication of the 1@PA6 doped films. The efficient RTP of this material is attributed to the rigid environment provided by the nylon matrix and the hydrogen bond interaction between nylon chains and the cyano-substituted benzimidazole dopants. In addition, the potential host-guest triplet energy transfer makes a contribution. It is of great interest to examine in the future whether nylons are able to embed other phosphors to achieve high-performance RTP with different emission colors. In addition, considering the good processability and stability of nylons, the explorations of the practical applications of these RTP materials are worthy of attention.

Generally, stable and robust RTP materials with high efficiency and long lifetime are required for practical applications. The commonly used matrices including PMMA and PVA are essentially non-luminescent and they serve merely as a rigid cage to restrict the movement of guest molecules and exclude water and oxygen. The potential host-guest energy transfer with the use of a luminescent matrix, like nylon, may provide an effective strategy to boost the generation of triplet excitons and thus increase the phosphorescence efficiency.

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