Phosphorimetry

Origin of Dual-Peak Phosphorescence and Ultralong Lifetime of 4,6-Diethoxy-2-carbazolyl-1,3,5-triazine

“…7 Following these early works, several studies on organic molecules containing heavy atoms such as Br, I and functional groups such as the carbonyl moiety have demonstrated the possibility for ISC facilitating the phosphorescence process. [8][9][10] Recently, An et al 11 synthesized simple organic molecules containing O, N, P that favored ISC. Their report suggested that H-aggregate dimers 12 (plane to plane stacked structures) effectively stabilize the triplet excited states, generating phosphorescence lifetimes of up to 1.35 s -several orders of magnitude longer than those of organic fluorophores.…”

“…Historically, Lewis and Kasha first recognized the function of the triplet excited state and the significance of intersystem crossing (ISC) in phosphorescent molecules, which they later in 1947confirmed to be the key parameters for phosphorescence in organic compounds . Following these early works, several studies on organic molecules containing heavy atoms such as Br and I and functional groups such as the carbonyl moiety have demonstrated the possibility for ISC facilitating the phosphorescence process. − Recently, An et al synthesized simple organic molecules containing O, N, and P that favored ISC. Their report suggested that H-aggregated systems (plane-to-plane stacked structures) effectively stabilize the triplet excited states, generating phosphorescence lifetimes of up to 1.35 s, several times longer than those of organic fluorophores. , However, they provided no explanation for why the studied organic phosphors show dual-peak emissions and ultralong lifetimes for the T 1 state.…”

Solid-Surface Luminescence Spectrometry

“…Fluorescence decay times range from approximately 10 s to 10 7 s. The radiative transition from an excited triplet state to the singlet ground state (phosphorescence) is spin-forbidden, however, which results in long lifetimes (from approximately 10-4 to 10 s) for a triplet electronic state and greatly increases the probability of collisional transfer of energy with other molecules. Because collisional transfer of energy is efficient in solution at room temperature, micelle, sensitized, and solid-surface room-temperature phosphorescence are widely used for chemical analysis (2).…”

“…In the six years since Analytical Chemistry published an instru MENTATION article on phosphorimetry (2), considerable progress has been made in developing an understanding of interactions in solid-surface RTP, in obtaining analytical RTP data, and in applying RTP to important analytical areas (4, 5). Fewer developments have occurred recently in instrumentation, however, because much of the instrumental development in solid-surface phosphorescence happened during the late 1970s and early 1980s.…”

Room-temperature phosphorescence of compounds in mixed organized media: synthetic enzyme model-surfactant system

“…Room-temperature phosphorimetry (RTF) is quite different from the classic low-temperature phosphorescence technique, which is typically performed in glass matrices at liquid nitrogen temperature (1). Since the discovery of RTF, numerous techniques have been developed to induce RTF from various molecules.…”