Dual Emission from Precious Metal-Free Luminophores Consisting of C, H, O, Si, and S/P at Room Temperature

Masaki Shimizu; Sho Nagano; Takumi Kinoshita

doi:10.1002/chem.201905820

Dual Emission from Precious Metal-Free Luminophores Consisting of C, H, O, Si, and S/P at Room Temperature

Chemistry. 2020 Apr 21;26(23):5162-5167. doi: 10.1002/chem.201905820. Epub 2020 Mar 6.

Authors

Masaki Shimizu¹, Sho Nagano¹, Takumi Kinoshita¹

Affiliation

¹ Faculty of Molecular Chemistry and Engineering, Kyoto Institute of Technology, 1 Hashikami-cho, Matsugasaki, Sakyo-ku, Kyoto, 606-8585, Japan.

PMID: 31951065
DOI: 10.1002/chem.201905820

Abstract

Fluorescence-phosphorescence dual-emissive compounds are valuable tools for ratiometric luminescence sensing. Herein, it is reported that 2,5-bis(phenylsulfonyl)- and 2,5-bis[bis(4-methoxyphenyl)phosphinyl]-1,4-disiloxybenzenes exhibit dual emission with emission peaks that were easily identified without performing time-gated measurement. The disiloxybenzenes in powder simultaneously fluoresced and phosphoresced at 358-374 and 457-470 nm, respectively, under vacuum. The intensity ratios of the phosphorescence/fluorescence maxima of the disiloxybenzenes in powder and in a thin film of poly(methyl methacrylate) were sensitive to temperature and molecular oxygen, respectively. The plots of the relative intensity versus temperature or partial pressure of molecular oxygen were well fitted with calibration curves defined by an exponential approximation with excellent correlation coefficients R² (0.9708-0.9921), demonstrating the high potential of the disiloxybenzenes as precious metal-free probes applicable to ratiometric luminescence sensing.

Keywords: charge transfer; donor-acceptor systems; materials science; photochemistry; silicon.