Evidence for erbium-erbium energy migration in erbium(III) bis(perfluoro-p-tolyl)phosphinate

Abstract

Photoluminescence lifetime measurements of the erbium decay in samples of erbium(III) bis(perfluoro-p-tolyl)phosphinate, Er[(p-CF3C6F4)2PO2]3, as a function of erbium concentration have been made. It has been found that for concentrations greater than 50%, the lifetime could be fitted with a stretched exponential function, which is indicative of erbium-erbium energy migration to quenching sites, most likely at the surface of the finely divided powder. At concentrations below 50%, the decay was single exponential with a maximum lifetime of ∼700μs.

Lanthanide luminescence for functional materials and bio-sciences

“…However, for x 4 0.7, the lifetime is approximately constant, pointing to the (large) upper limit of Er III concentration (up to 30 mol%) that could be utilized in optical devices based on this system. 70 A slightly modified synthetic procedure of [Er(7b) 3 ] gives rise to nanorods with double-exponential luminescence decays. The average Er( 4 I 13/2 ) lifetime is equal to 300 ms, in perfect agreement with the above-mentioned value.…”

“…Noteworthy features are the visible excitation of [Ln(20a) 3 (phen)] via an ILCT state 82 and the Scheme 2 Phosphinic acid-and hydroxypyridine-containing ligands. [68][69][70][71][72][73][74] Scheme 3 Carboxylic and polyaminocarboxylic acids. 75,[77][78][79][80][81]91,97 This , 0.17%.…”

Population Saturation in Trivalent Erbium Sensitized by Organic Molecular Antennae

“…Recently, halogenation of the ligands and dispersion of the complexes in IR transmitting media, e.g., perfluorinated polymers, has been shown to be effective in reducing vibrational quenching induced by C-H groups, with consequent increase in Er III lifetime by 2 orders of magnitude. [14][15][16] If τ reached the radiative limit, threshold pump intensity would be decreased to values less than 5 W/cm 2 that are practical for indirect pumping by semiconductor light-emitting diodes. 17 In conclusion, we show experimental evidence for transient Er III population saturation near inversion threshold in a monometallic coordination complex exhibiting very efficient lanthanide-ion sensitization.…”

Functionalisation of ligands through click chemistry: long-lived NIR emission from organic Er(iii) complexes with a perfluorinated core and a hydrogen-containing shell

“…The erbium emission lifetimes of complexes Er(PL A-D ) 3 at 1536 nm wavelength were measured for a series of each complex where the Er 3+ ions was diluted with Y 3+ ions in order to explore the intrinsic erbium emission lifetimes without inter-ion interactions. 13,16,17 As the Y 3+ ion has approximately the same ionic radius as Er 3+ ion, the Y(PL R ) 3 complexes are of the same phase as the corresponding Er(PL R ) 3 counterparts, which was indicated by X-ray powder diffraction (ESI, Fig. S4 †).…”