Room‐Temperature Phosphorescence in Pure Organic Materials: Halogen Bonding Switching Effects

Abstract

Organic room-temperature phosphorescence (ORTP), when combined with external stimuli-responsive capability, is very attractive for sensors and bio-imaging devices, but remains challenging. Herein, by doping two β-iminoenamine-BF₂ derivatives (S-2CN and S-2I) into a 4-iodoaniline (I-Ph-NH₂ ) crystalline matrix, the formation of S-2CN⋅⋅⋅I-Ph-NH₂ and S-2I⋅⋅⋅I-Ph-NH₂ halogen bonds leads to bright-red RTP emissions from these two host-guest doped crystals (hgDCs) with quantum efficiencies up to 13.43 % and 15.96 %, respectively. Upon treatment with HCl, the competition of I-Ph-NH₂ ⋅HCl formation against S-2I⋅⋅⋅I-Ph-NH₂ halogen bonding switches off the red RTP from S-2I/I-Ph-NH₂ hgDCs, whereas the stable halogen-bonded S-2CN⋅⋅⋅I-Ph-NH₂ ensures red RTP from S-2CN/I-Ph-NH₂ hgDCs remains unchanged. A security protection luminescence pattern by using these different HCl-responsive RTP behaviors was designed.