Single-component solid state white-light emission and photoluminescence color tuning of a Cd(ii) complex and its application as a luminescence thermometer

Abstract

A single-component white-light emitting Cd(ii) complex exhibits tunable photoluminescence and acts as a novel luminescence thermometer based on the correlation between temperature and color temperature.

Single-component panchromatic white light generation, and tuneable excimer-like visible orange and NIR emission in a Dy quinolinolate complex

“…4b and c) and a PL quantum yield (PLQY) of B14% which is relatively high among those reported for molecular whitelight emitting materials. 5,8 The characteristics of the observed spectral profile are consistent with those typical of a p-stacked aromatic organic system displaying excimer-like (EL) emission. 24,36,37 Short-contact (o0.4 nm) interactions favor supramolecular energy states that give rise to intermolecular CT transitions at significantly lower energy than singlemolecule transitions.…”

“…Colour-tuneable white light luminescent molecular materials attract great interest for a wide range of applications such as flat panel displays, illumination, sensing and anticounterfeiting. [1][2][3][4][5][6][7] Traditionally, white light generation is realized through the combination of different luminescent centers to reach the appropriate balance of the primary colors red, green and blue (RGB). Alternatively, it can be obtained by the ratiometric fine-tuning of complementary light colours, such as blue and yellow.…”

“…Alternatively, it can be obtained by the ratiometric fine-tuning of complementary light colours, such as blue and yellow. 1,8,9 Different classes of molecular materials have been so far explored in this field ranging from transition metals 5,10,11 and lanthanide complexes, 8,9,[12][13][14] to metalorganic extended frameworks, 6,7,16,17 purely organic polymers 18,19 and discrete molecular units giving rise to excimer (or excimer-like) emission. [20][21][22][23][24] Most often these materials are obtained by incorporating the emissive components into (codoped) polymers, host-guest systems, or by cocrystallization of the selected luminophores.…”

“…[20][21][22][23][24] Most often these materials are obtained by incorporating the emissive components into (codoped) polymers, host-guest systems, or by cocrystallization of the selected luminophores. Among the various types of materials, metal-organic luminophores can offer the opportunity to combine light emission of different origins, such as ligand-centered (LC), metal-centered (MC), charge transfer (CT), excimer (EX) or excimer-like (EL), thus significantly expanding the emission range and tunability of the emission colour with respect to fully organic and inorganic materials, 1,5,7 and even adding more functionalities such as magnetic response. 14,15 In particular, lanthanide-based molecular materials are very popular for white light generation and other optical applications in view of the high emission colour purity delivered by the lanthanide intrashell f-f transitions, spanning the entire visible and near-infrared (NIR) spectrum.…”

Thermo-responsive light-emitting metal complexes and related materials

“…14 shows an example of thermo-responsive Cd(II) complex 15, Cd(Sal) 4 (PyNH 2 ) 2 (Sal = 2-formylphenolato, PyNH 2 = 4-aminopyridine), reported by Miao, Nie, and coworkers. 103 The crystalline 15 showed white emission at rt. Upon grinding, it was transformed into a green-emissive solid.…”