The development of organic materials displaying room-temperature phosphorescence is a research field that has attracted more and attention in the last years. Most studies focus on designing or optimizing emitter molecules to increase phosphorescent performance host:emitter systems. Rarely, overall thin-film preparation routines are compared with respect their triplet-state luminescence yield. H...

Europium (Eu) doped ZnO microsphere based nano-sheets were synthesized through hydrothermal method. Effects of different concentrations of Europium on structural and optical properties of ZnO nano-sheets were investigated in detail. Prepared un-doped and Eu-doped ZnO samples were characterized using X-Ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron micro...

The rigid [Cu(dmp)(phanephos)](+) complex displays a high luminescence quantum yield of 80% at ambient temperature. In contrast to the long-lived phosphorescence of 240 μs at T < 120 K with a radiative rate of k(r) = 3 × 10(3) s(-1), the ambient-temperature emission represents a thermally activated delayed fluorescence (DF) with a decay time of only 14 μs and a radiative rate of k(r)(DF) = 6 × ...

The zirconium-mediated syntheses of pinacolboronate (BPin) appended benzo[b]tellurophenes and two phenyl/BPin substituted tellurophene isomers with different colors of emission have been achieved. These species are new additions to an emerging class of inorganic heterocycles that display visible phosphorescence in the solid state under ambient conditions.

An in cellulo study of the ultrafast excited state processes in the paradigm molecular light switch [Ru(bpy)2dppz](2+) by localized pump-probe spectroscopy is reported for the first time. The localization of [Ru(bpy)2dppz](2+) in HepG2 cells is verified by emission microscopy and the characteristic photoinduced picosecond dynamics of the molecular light switch is observed in cellulo. The observ...

Evaluating cerebral oxygenation is of critical importance for the understanding of brain function and several neuropathologies. Although several techniques exist for measuring cerebral oxygenation in vivo, the most widely accepted techniques offer limited spatial resolution. We have developed a confocal imaging system for minimally invasive measurement of oxygen tension (pO(2)) in cerebral micr...

The complexes AlQ(3) and Ir(ppy)(3) (Q = 8-hydroxyquinolate; ppy = 2-phenylpyridyl) are typical green emitting fluorescence and phosphorescence materials, respectively. Here we hybridize Ir(ppy)(3) with AlQ(3) to investigate the optoelectronic properties of the Ir(III)-centred derivatives including (ppy)(2)IrQ, (ppy)IrQ(2) and IrQ(3) by using density functional methods. Our calculations show th...

Two cationic cyclometallated iridium(III) complexes with 2,2'-bipyridine-acylhydrazone were synthesized and characterized by spectroscopic and photophysical measurements. They exhibit remarkable aggregation-induced phosphorescent emission (AIPE) phenomenon which is caused by the restriction of rapid isomerization of the C=N bond in the acylhydrazone moiety and are supported by TD-DFT studies. T...

We demonstrate that changes in the surrounding environment of triplet chromophore play a crucial role changing organic room-temperature phosphorescence lifetime, with range from 0.84 ms (ET) to 325.26 (MT).

Nonconventional luminophores have attracted significant attention for their unique photophysical properties and potential applications in different areas. Unlike classic luminogens consisting of remarkably conjugated segments, nonconventional generally possess merely nonconjugated or short-conjugated structures based on electron-rich units. Fluorescence, phosphorescence, even color tunable room...