Fig. 3: Rate constants of radiative and non-radiative recombination and PLQY as well as their correlations with the microscopic parameters.
From: Bright short-wavelength infrared organic light-emitting devices
a–c, Rate constants of non-radiative recombination knr (a) and radiative recombination kr (b) for solid films and PLQY (c) as a function of the optical bandgap with respect to variation in the oscillator strength f (electronic coupling Vc), low-frequency reorganization energy λs and mean phonon energy \(h\bar \nu _{\mathrm{v}}\) while the electron–phonon coupling factor S is fixed at 0.8. The electronic coupling Vc is related to f via the generalized Mulliken–Hush method41,43. The symbols denote data points for non-radiative and radiative recombination rate constants extracted from analysis of the time-resolved PL measurements and PLQY values for a set of representative A-D-A-type molecules and a fullerene derivative as \(k_{{{{\mathrm{nr}}}}} = \frac{1}{\tau } - k_{\mathrm{r}}\) and \(k_{{{\mathrm{r}}}} = \frac{{{\mathrm{PLQY}}}}{\tau }\). The chemical structure of the molecules are included in the Supplementary Information. The symbols and error bars represent the mean value ± one standard deviation across six measurements for each emitter (Supplementary Table 1). The PLQY measurements were carried out under ambient conditions.
