Mo₆ cluster-based compounds for energy conversion applications: comparative study of photoluminescence and cathodoluminescence

Abstract

We report the photoluminescence (PL) and cathodoluminescence (CL) properties of face-capped [Mo6Xi 8La 6]2− (X = Cl, Br, I; L = organic or inorganic ligands) cluster units. We show that the emission of Mo6 metal atom clusters depends not only on the nature of X and L ligands bound to the cluster and counter-cations, but also on the excitation source. Seven members of the AxMo6Xi 8La 6 series (A = Cs+, (n-C4H9)4N+, NH4 +) were selected to evaluate the influence of counter-cations and ligands on de-excitation mechanisms responsible for multicomponent emission of cluster units. This study evaluates the ageing of each member of the series, which is crucial for further energy conversion applications (photovoltaic, lighting, water splitting, etc.).

Red-NIR luminescence of Mo6 monolayered assembly directly anchored on Au(001)

“…At 80 K, the emission spectrum shows one band maximum at 770 nm and two pronounced shoulders located at 720 and 835 nm. Similar features have been observed on parent Mobased clusters by PL and cathodoluminescence, 24,40 they are best interpreted as the superposition of several emissions due to different excited states whose population is temperature dependent. For (NH 4 ) 2 [Mo 6 Br 8 (NCS) 6 ] studied herein, the emission intensities of states emitting at 770 and 835-840 nm increase importantly, the latter even more than the former.…”

Low dimensional solids based on Mo6cluster cyanides and Mn2+, Mn3+or Cd2+metal ions: crystal chemistry, magnetic and optical properties

“…Such modulation of optical and magnetic properties by charge switching is particularly relevant for the elaboration of functional hybrid materials. 14…”

“…It is known that the most efficient excitation is obtained in the UV/blue region. 13,14 13,14 Emission maxima are found at around 675 nm for both 4 and 5.…”

Preparation by electrophoretic deposition of molybdenum iodide cluster-based functional nanostructured photoelectrodes for solar cells

“…Stokes shift, [58][59][60][61] their intense absorption in the UV-vis domain [43] and their (photo)catalytic properties [62,63] leading to their potential use in energy, [43,64] (photo)catalysis, [63,65] optoelectronic devices [63] and biotechnologies. [67][68][69][70] Thus, we have reported the use of the [Mo 6 I 14 ] 2cluster as a sensitizer in n-or p-type solar cells with a TiO 2 -based photoanode or a NiO-based photocathode, respectively.…”