Abstract
Strong coupling between light and matter leads to the spontaneous formation of hybrid light–matter states, having different energies than the uncoupled states. This opens up for new ways of modifying the energy landscape of molecules without changing their atoms or structure. Heavy metal-free organic light emitting diodes (OLED) use reversed intersystem crossing (RISC) to harvest light from excited triplet states. This is a slow process, thus increasing the rate of RISC could potentially enhance OLED performance. Here we demonstrate selective coupling of the excited singlet state of Erythrosine B without perturbing the energy level of a nearby triplet state. The coupling reduces the triplet–singlet energy gap, leading to a four-time enhancement of the triplet decay rate, most likely due to an enhanced rate of RISC. Furthermore, we anticipate that strong coupling can be used to create energy-inverted molecular systems having a singlet ground and lowest excited state.
Highlights
C hemists can today synthesize virtually any molecule imaginable
Strong coupling has been observed in molecular crystals[6,7,8], J-aggregates[9,10,11,12,13], polymers[14,15,16], small molecules in a polymer or silicon dioxide matrix[17,18,19,20,21,22,23,24,25,26], large light-harvesting complexes[27] and even liquid crystals[28]
By observing the temperature dependence of the triplet decay rate, the lowering of the activation energy of reversed intersystem crossing (RISC) is in good agreement with the energy difference between the excitonic and lower polaritonic state, as measured with absorbance spectroscopy
Summary
C hemists can today synthesize virtually any molecule imaginable. By fine-tuning the molecular structure, optimized physical, chemical, or biological properties are routinely achieved. The dependence of the Rabi splitting on the magnitude of the transition dipole moment suggests that strong coupling could be used to selectively modify the energy levels of singlet states, without significantly perturbing the energy levels of triplet states. By observing the temperature dependence of the triplet decay rate, the lowering of the activation energy of RISC is in good agreement with the energy difference between the excitonic and lower polaritonic state, as measured with absorbance spectroscopy.
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