Herein, we demonstrate how RTP can be turned on from an organic emitter, TPA-CO2H, a compound that does not include heavy atoms, in a wide range of host matrices that are capable of hydrogen bonding, which suppresses molecular vibrations thereby triggering efficient RTP (Figure ), reflected by the reduced conical intersection between T1 and S0 states. In the absence of hydrogen bonding interactions, T1 excitons deactivate via the conical intersection or saddle point between T1 and S0 (Figure , left). However, this scenario can be altered by the introduction of hydrogen bonding, allowing T1 excitons to radiate as photons (Figure , right). We cross-compare its photophysical behavior to model compounds triphenylamine (TPA) and TPA-CO2Me. Efficient blue RTP of TPA-CO2H is observed when doped in PVA, boric acid, granulated white sugar, edible gelatine, and paper, where the FPh is as high as 46%, and the tPh is on the order of 275 ms. This simple strategy of doping inexpensive fluorophores like TPA-CO2H in different hydrogen bond-rich matrices demonstrates both the generality of our approach and also showcases how facile post-processing of the blend can lead to potential useful applications, exemplified by afterglow origami, black-light (UV excitation) writable paper, information display, and anti-counterfeiting.