However, all previously reported binary OLPL systems 3 -5, 10 -16 have shown green to red light with a broad peak that does not match well with scotopic vision. These OLPL systems are mainly based on the luminescence of intermolecular charge-transfer (CT) excited states, which is more challenging to achieve a blue emission . Additionally, accurate prediction of the position and width of the intermolecular CT emission peak through quantum chemical calculations is difficult . Although the emission color of the OLPL system can be adjusted by energy transfer from the CT excited state to additional suitable emitters , blue CT emission is required for the energy transfer to the blue emitters. Therefore, the development of the blue OLPL system that matches the scotopic vision is crucial for achieving OLPL systems with high human visual sensitivity.