Fig. 4From: White light emitting diode based on purely organic fluorescent to modern thermally activated delayed fluorescence (TADF) and perovskite materials(Reproduced with permission form Ref. [19] Copyright 1997 ©Applied Physics Letters)a EL spectra of m-LPPP (solid line) and the PL spectra of PPDB in solid state (dashed line) and solution form (circles). b EL spectra of the WPLED at different applied voltageBack to article page