Phosphorescence emission of PMMA matrices

Fluorescence of Nonaromatic Organic Systems and Room Temperature Phosphorescence of Organic Luminogens: The Intrinsic Principle and Recent Progress

“…For host–guest systems, basically, the host matrix should be compatible with guest molecules and the excited triplet and single energy levels of host materials should be greater than those of guest phosphors to prevent energy transfer from the luminescent guests to the nonluminous hosts . Transparent and rigid steroid plastic of PMMA is commonly used, which can suppress nonradiative decay to support persist RTP with a lifetime of up to 5.58 s. Recently, a record of ultralong RTP was achieved by two simple organic molecules that could last for more than 1 h at room temperature . The strongly electron‐donating molecule N,N,N,N ′‐tetramethylbenzidine, with a very stable radical cation, was selected as the guest molecule and the strongly electron‐accepting molecule, 2,8‐bis(diphenylphosphoryl) dibenzo[b,d]thiophene, with a high triplet energy, provided a rigid amorphous environment as the host matrix to suppress nonradiative deactivation.…”