Charge transfer luminescence

Sometimes, LMCT or MLCT luminescence may compete with ligands-based luminescence, resulting in two emission bands. For example, excitation of the zinc MOF Zn2(ATA)3(ATA)2/2 at 320 nm at room temperature produces a blue luminescence with a weak emission peak centered at 485 nm that may be assigned to the 

LMCT or MLCT and a significantly strong emission with the maximum peak at 392 nm originated from ligands-based emission [114]. 

---

J. N. Demas and G. A. Crosby, Quantum efficiencies of transition metal complexes. II. Charge transfer luminescences, /. Am. Chem. 93, 2841-2847 (1971). 

C. Anion-Cation Annihilation and Charge-Transfer Luminescence 433... 

McClenaghan ND, Leydet YM, Indelli MT, Campagna S. Excited-state equilibration a process leading to long-lived metal-to-ligand charge transfer luminescence in supramolecular systems. Coord Chem Rev 2005 249 1336-50. 

A range of vinyl and carboxypyridyl derivatives of [Ru(bipy)2]2+ have been prepared and electron transfer reactions and the photochemical activity of these complexes as polymer films at electrode surfaces studied.745,861,953 1058 1138-1148 Some chemical transformations involving polyvinyl pyridine (PVP) are illustrated in Scheme 28.1138,1142-1144,1149 The charge transfer luminescence spectra of cis- and tranA-[Ru(bipy)2py2]2+,1096,1150 czs-[Ru(bipy)2L2]4+ (L = 2-methyl-4,4 -bipyridinium+),1151 cis- and traru-[Ru bipy)(phen)py2]2+, [Ru(bipy)py2(L)]2+ (L = en, (NH3)2, 2-methylaminopyridine, 2-ethylaminopyridine) and [RuCl(bipy)py3]+ have been measured.1096... 

Figure 10. Branched Pd(II)-, Pt(II)-alkynyl complexes that exhibit considerable intraUgand charge-transfer luminescence character.

A second pertinent feature of the decay kinetics of complexes that display charge-transfer luminescence is the exponentiality of the observed transients at all temperatures reached — 1.5 K). This behavior is in stark contrast to that exhibited by organic systems at low temperatures. For the latter, single exponential decays are maintained to 10°K, but they are replaced by complicated kinetics at lower temperatures (2). Nonexponential decays have also been observed at low temperature for tris complexes of rhodium (III) that exhibit states lowest (14),... 

Niki, M., Yoshikawa, A., Fukuda, T. 2004b. Charge transfer luminescence in Yb -containing compounds. Optical Materials 26 545-549. 

Yanagida, T., Fujimoto, Y, Kurosawa, S. et al. 2011a. Ultrafast transparent ceramic scintillators using the Yb charge transfer luminescence in REjOj Host. Applied Physics Express 4 126402. 

Guerassimova N, Dujardin C, Gamier N, Pedrini C, Petrosyan AG, Kamenskikh lA et al (2002) Charge-transfer luminescence and spectroscopic properties of Yb " in aluminium and gallium garnets. Nucl Instmm Methods Phys Res Sect A Accelerators Spectrometers Detectors Assoc Equip 486 278-282... 

Charge transfer luminescence has also been observed from diimine complexes of Rh , Ir and Pt . A review of Pt diimine complexes exhibiting MLCT emission was recently published. ... 

Krasikov DN, Scherbinin AV, VasiTev AN, Kamenskikh lA, Mikhailin W (2008) Model of Y2O3 - Yb charge-transfer luminescence based upon ab initio cluster calculations. J Lumin 128 1748-1752... 

Paris JB, Brandt WW (1959) Charge transfer luminescence of a Ruthenium(II)chelate. J Am Chem Soc 81 5001-5002... 

---