White Light Emission from Planar Remote Phosphor Based on NHC Cycloplatinated Complexes

• DOI: 10.1021/acsami.6b03288
• Publication Date: 2016-06-07T20:06:05Z
• Authors: Sara Fuertes; Andrés J. Chueca; Mariano Perálvarez; Pilar Borja; Marc Torrell; Josep Carreras; Violeta Sicilia
• Keywords: Cationic polymerization

We report on the generation of bright white luminescence through solid-state illumination remote phosphors based novel cycloplatinated N-heterocyclic carbene (NHC) compounds. Following a stepwise protocol we got new NHC compound [{Pt(μ-Cl)(C(∧)C*)}2] (4) (HC(∧)C*-κC* = 1-(4-(ethoxycarbonyl)phenyl)-3-methyl-1H-imidazol-2-ylidene), which was used together with related ones 4a (HC(∧)C*-κC*= 1-(4-cyanophenyl)-3-methyl-1H-imidazol-2-ylidene) and 4b 3-methyl-1-(naphthalen-2-yl)-1H-imidazol-2-ylidene) as starting materials for synthesis ionic derivatives [Pt(R-C(∧)C*) (CNR')2]PF6 (R -COOEt, R' t-Bu (5), Xyl (6); R -CN, (7), (8); R(∧)C Naph, (9), (10)). The X-ray structures 6 8-10 have been determined. photophysical properties these cationic compounds studied supported by time-dependent-density functional theory (TD-DFT) calculations. 5, 8, 9 revealed most efficient emitters in solid state quantum yields 41%, 21%, 40%, respectively. White-light remote-phosphors prepared just stacking different combinations [Pt(bzq) (CN) (CN(t)Bu)] (R1) blue (5, 8), yellow red components onto same substrate. CCT (correlated color temperature) CRI (color rendering index) emitted white-light tuned accurately controlling individual contributions.