Variable temperature PL studies of the ligand L4 and complex 5 were performed between 300 and 2 K. The emission spectrum of L4 showed two PL peaks centered at 412 (I2) and 486 (I1) nm at 2 K. Upon increasing the temperature, the position and the FWHM of 486 nm peak increases monotonously. In contrast, the emission spectrum of 5 at 2 K shows two additional bands at around 600 (I3) and 445 (I4) nm, along with slightly blue-shifted ligand-based peaks I1 and I2.