A new record excited state 3MLCT lifetime for metalorganic iron(ii) complexes

The ³MLCT lifetime of iron complexes was pushed to a record lifetime of 26 ps using a new benzimidazolylidene-based C^∧N^∧C ligand opening up new perspectives on the way of applying such complexes to photoelectrochemical processes.

Exploring the self-assembly and energy transfer of dynamic supramolecular iridium-porphyrin systems

We present the first examples of dynamic supramolecular iridium–zinc porphyrin systems.

Influence of para substituents in controlling photophysical behavior and different non-covalent weak interactions in zinc complexes of a phenol based "end-off" compartmental ligand

Three dinuclear zinc(II) complexes with "end-off" compartmental ligands, namely 2,6-bis(N-ethylmorpholine-iminomethyl)-4-R-phenol (R = -CH3, Cl, (t)Bu) have been synthesized with the aim of exploring the role of the para substituent present in the ligand backbone in controlling the structural diversity, photophysical properties and different weak interactions of the complexes. All three species, with the general formula {2[Zn2L(CH3COO)2][Zn(NCS)4]}, show the complex anion Zn(NCS)4(2-) as a common structural feature decisive for crystallization. Interestingly, all of them possess several non-covalent weak interactions where the nature of the "R" group plays an essential role as exposed by DFT study. Besides exhibiting fluorescence behavior, the complexes also show para substitution controlled phosphorescence both at room and low temperature. Anisotropy studies suggest the existence of complexes 2 and 3 as dimers in solution. The origins of the unusual room temperature phosphorescence and fluorescence behavior of the complexes have been rationalized in the light of theoretical calculations.

Quantitative prediction of photoluminescence quantum yields of phosphors from first principles

The first quantitative prediction of the photoluminescence quantum yields (PLQY) of a series of blue-to-green Ir(iii) complexes is presented.

Optimizing the photoluminescence quantum yields of Ir(iii) complexes is the key to their application as phosphors in organic light-emitting diodes (OLEDs). This work demonstrates for the first time that quantitative predictions of photoluminescence quantum yields (PLQY) in a series of blue-to-green Ir(iii) complexes can be derived exclusively from electronic structure calculations.

Molecular Structure-Intersystem Crossing Relationship of Heavy-Atom-Free BODIPY Triplet Photosensitizers

A thiophene-fused BODIPY chromophore displays a large triplet-state quantum yield (ΦT = 63.7%). In contrast, when the two thienyl moieties are not fused into the BODIPY core, intersystem crossing (ISC) becomes inefficient and ΦT remains low (ΦT = 6.1%). First-principles calculations including spin-orbit coupling (SOC) were performed to quantify the ISC. We found larger SOC and smaller singlet-triplet energy gaps for the thiophene-fused BODIPY derivative. Our results are useful for studies of the photochemistry of organic chromophores.

Experimental and theoretical studies of highly emissive dinuclear Cu(i) halide complexes with delayed fluorescence

Experimental and theoretical studies of the photophysical properties of three novel emissive dinuclear Cu(i) halide complexes with thermally activated delayed fluorescence (TADF) are reported.

Spectroscopic and second-order nonlinear optical properties of Ruthenium(ii) complexes: a DFT/MRCI and ADC(2) study

We present an assessment of correlated electronic structure methods for the nonlinear optical properties of Ru(ii) dyes.

Charge-transfer excited states in phosphorescent organo-transition metal compounds: a difficult case for time dependent density functional theory?

A series of 17 platinum(ii) and iridium(iii) complexes have been investigated theoretically and experimentally to elucidate the charge-transfer character in emission from the lowest triplet state. TDDFT is found to be surprisingly accurate.

Combined theoretical and time-resolved photoluminescence investigations of [Mo6Bri8Bra6]2− metal cluster units: evidence of dual emission

Distinct emissive species have been identified in [Mo₆Brⁱ₈Br^a₆]²⁻ containing systems. Strong geometrical relaxations of the triplet excited states are responsible for the huge energy shift leading to intense red-NIR emission.

Impacts of terminal modification of [Ru(phen)2dppz]2+on the luminescence properties: a theoretical study

Lowest singlet transitions were found to be related to the intriguing luminescence properties of three different dppz-like ruthenium(ii) complexes through a theoretical study.