Ultralong organic room-temperature phosphorescence of electron-donating and commercially available host and guest molecules through efficient Förster resonance energy transfer

Ultralong organic room-temperature phosphorescence (RTP) materials have attracted tremendous attention recently due to their diverse applications. Several ultralong RTP mimicking the host-guest architecture of inorganic systems been exploited successfully. However, complicated synthesis and high expenditure are still inevitable in these studies. Herein, we develop a series novel systems, which all luminophores electron-rich, commercially available halogen-atom-free. The maximum efficiency longest lifetime could reach 23.6% 362 ms, respectively. Experimental results theoretical calculation indicate that host molecules not only play vital role providing rigid environment suppress non-radiative decay guest, but also show synergistic effect guest through Forster resonance energy transfer (FRET). commercial availability, facile preparation unique properties make new an excellent candidate for anti-counterfeiting application. This work will inspire researchers with different wavelengths from luminophores.