The development of high-performance near-infrared organic light-emitting diodes is hindered by strong non-radiative processes as governed by the energy gap law. Here, we show that exciton delocalization, which serves to decouple the exciton band from highly vibrational ladders in the S₀ ground state, can bring substantial enhancements in the photoluminescence quantum yield of emitters, bypassing the energy gap law. Experimental proof is provided by the design and synthesis of a series of new Pt(ii) complexes with a delocalization length of 5–9 molecules that emit at 866–960 nm with a photoluminescence quantum yield of 5–12% in solid films. The corresponding near-infrared organic light-emitting diodes emit light with a 930 nm peak wavelength and a high external quantum efficiency up to 2.14% and a radiance of 41.6 W sr⁻¹ m⁻². Both theoretical and experimental results confirm the exciton–vibration decoupling strategy, which should be broadly applicable to other well-aligned molecular solids.

高性能的近红外有机发光二极管的发展受到能隙定律控制的强大的非辐射过程的阻碍。在这里，我们表明，激子离域化可以使激子带与处于S ₀基态的高度振动的梯子解耦，可以绕过能隙定律，大大提高发射体的光致发光量子产率。通过一系列新Pt（ii的设计和合成）提供了实验证明）的复合物，其离域长度为5–9的分子，在866–960 nm处发出光，固体膜中的光致发光量子产率为5–12％。相应的近红外有机发光二极管发射的光具有930 nm的峰值波长和高达2.14％的高外部量子效率以及41.6 W sr ^-1  m ^-2的辐射。理论和实验结果均证实了激子-振动解耦策略，该策略应广泛适用于其他排列良好的分子固体。