We report luminescence of 2,6-diphenyl-4-(2,4,6-triphenyl-1-pyridinio)phenolate (B30)- or other betaine dye-dispersed rigid media at 77K and at room temperature (r.t.). Their luminescence in acetone at 77K were remarkably influenced by water addition. UV-excited blue similar to bluish green luminescence of B30-dispersed polymers at r.t. we reported in our previous reports appeared to resemble that of B30-dispersed acetone at 77K in the presence of water. It suggests the participation of protonation and/or deprotonation processes in the UV-excited states of B30. A weak emission shoulder in visible emission wavelength range was also observed for B30-dispersed polymeric solids at r.t., similar to those emission bands for betaine dye-dispersed polymeric solids or organic solvents at 77K.