Pyrazine-driven dinuclear assembly of dysprosium(iii) ?-diketonate complex: a
fluxidentate bridging approach toward functional near-white luminescent
materials
#MMPMID41384060
Aggarwal V
; Singh D
; Redhu S
; Bhagwan S
; Kumar S
; Malik RS
; Kumar P
; Sindhu J
; Kumar V
RSC Adv
2025[Dec]; 15
(57
): 49227-49242
PMID41384060
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Three single component Dy(iii) complexes featuring ?-diketone ligand TTBD
(4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione) were studied for their potential
as white-light emitters. The complexes include a water-containing species (DyA)
and two anhydrous species (DyM and DyD) incorporating the auxiliary bidentate
ligand pyrazine (pyz). The coordination geometry and ligand environment,
particularly the nuclearity and presence of sensitizing co-ligands, significantly
influence the relative intensities of the characteristic Dy(iii) yellow (4)F(9/2)
? (6)H(13/2) and blue (4)F(9/2) ? (6)H(15/2) and ligand-based phosphorescence
emissions. The introduction of pyrazine enhances energy transfer efficiency,
leading to improved Dy(iii) emission output. Chromaticity coordinates measured at
RT indicate that DyA (0.339, 0.336), DyM (0.404, 0.428) and DyD (0.323, 0.367)
emit light close to the ideal white light coordinates (0.333, 0.333) as defined
by the CIE system. Corresponding CCT values further classify DyA (5202 K) and DyD
(5845 K) as cool white emitters, while DyM (3786 K) lies within the
neutral-yellowish range. Emission branching ratio (? (R)) analysis reveals that
the (4)F(9/2) ? (6)H(13/2) transition dominates (>90%), suggesting its
suitability for laser amplification applications. In addition to their
visible-light emission, the Dy(iii) complexes exhibit good thermal stability and
semiconducting characteristics, as confirmed by thermogravimetric (TG) and UV-Vis
studies, respectively. Collectively, these findings support the potential
application of these Dy(iii) complexes as efficient, single component emitters
for white light emitting devices (WLEDs).
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