White Luminescent Silica Layers: The Molecular Design Beneath

Abstract

United for white: Bright white silica single layers are obtained by exploiting efficient red (Eu3+) and green (Tb3+) luminescent antenna complexes and a blue‐light‐emitting carbazole derivative (see picture). By combining the mild sol–gel solution route with the peculiar chemical and photophysical behaviour of selected light‐emitting species, white luminescent materials with colour stability and shaped architecture are easily obtained through a molecular design strategy.

Layered Tb‐Doped Yttrium Carboxyphosphonate Nanocrystals as Efficient Filler for PEDOT:PSS Composite Films

“…However, the population of the emissive electronic state of Tb III ( 5 D 4 state, lying at 20 500 cm −1 ) through direct light absorption is spin‐forbidden, leading to very low photoluminescence quantum efficiency. On the contrary, highly photoluminescent Tb III complexes bearing light absorbing antennas able to sensitize the lanthanide emission have been reported . In 2 mw , the glyphosate acts as coordinating unit, UV‐light absorbing and sensitizing antenna, as its excitation leads to a detectable Tb III centered emission.…”

“…In 2 mw , the glyphosate acts as coordinating unit, UV‐light absorbing and sensitizing antenna, as its excitation leads to a detectable Tb III centered emission. However, the Tb III ‐centered photoluminescence can be strongly affected and quenched also in antenna‐lanthanide complexes, depending upon several factors . Here, the low emission intensity registered for 2 mw could be ascribed to: i) a low amount of Tb III in the structure; ii) a low absorption coefficient of the glyphosate at the excitation wavelength; ii) a sub‐optimal energy transfer between the glyphosate excited triplet and the emitting electronic state of Tb III , due to excessive vicinity of their relative energies.…”

“…[29][30][31] However,t he population of the emissive electronic state of Tb III ( 5 D 4 state, lying at 20 500 cm À1 )t hrough direct light absorption is spin-forbidden, leadingt ov ery low photoluminescence quantume fficiency.O nt he contrary,h ighly photoluminescent Tb III complexes bearing light absorbinga ntennas able to sensitize the lanthanide emission have been reported. [32,33] In 2mw,t he glyphosate acts as coordinating unit, UVlight absorbing and sensitizing antenna, as its excitation leads to ad etectable Tb III centered emission.H owever,t he Tb III -centered photoluminescence can be strongly affected and quenched also in antenna-lanthanide complexes, depending upon severalf actors. [32] Here, the low emission intensity registered for 2mw could be ascribed to:i )alow amounto fT b III in the structure;i i) al ow absorption coefficient of the glyphosate at the excitation wavelength;i i) as ub-optimale nergy transfer between the glyphosate excited triplet and the emitting electronic state of Tb III ,d ue to excessive vicinity of their relative energies.…”

Visible-emitting hybrid sol–gel materials comprising lanthanide ions: thin film behaviour and potential use as phosphors for solid-state lighting

“…49,55 Based on these, work is currently underway to particularly design more efficient white emitting hybrid materials by modification of the synthetic approach.…”

A colour tunable microcavity by weak-to-strong coupling regime transition through a light-switchable material

“…1 (right). Tb shows the typical line-like emission bands in the B480-650 nm range 16 and an absorption profile centred at B300 nm assigned to p-p transitions of the coordinating ligands. 17 Moreover, ellipsometry measurements have been performed on thin films in order to determine the optical constants, such as the real (n) and imaginary (k) parts of the refractive index.…”