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. 2014 Aug 14;4:6071. doi: 10.1038/srep06071

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(A) EQE_PV (red) and the spectral emission flux (black) at a current injection condition corresponding to J_sc at 1 sun. The vertical line at the peak of EL marks the direct band gap energy at 1.61 eV. The ratio between the total emitted number of photons and the injected current equals the EQE_EL. (B) The 300 K BB spectra (dashed magenta) multiplied with the EQE_PV provides the photon flux distribution (thick dashed blue line) which, when integrated, corresponds to the dark saturation current in its radiative limit. The identical shape of the spectra, with ~18 magnitudes lower emission flux compared to in (A), certifies the reciprocity relation.