Synthesis of quenchers to control the fluorescence of Rhodamine B and improve the contrast ratio of blue filters for LCDs

Abstract

In this study, seven quenchers (derived from either anthraquinone, phthalimidylazo, or dipyrromethene chromophores) were prepared as candidates for additives to suppress fluorescence in blue colour filters and thus improve their contrast ratio. To reduce fluorescence effectively, quenchers must have typical properties such as spectral compatibility by which the absorbance spectrum of the quencher overlaps the fluorescence emission spectrum, exhibit high molar extinction coefficients, and exert little influence on the colour of the blue filter. The seven quenchers possessed absorption maxima of approximately 570-620 nm and reduced fluorescence (by more than 24%). Those quenchers tested in filter coatings increased their contrast ratios by about 50%. They thus effectively quenched fluorescence of the blue filter but without greatly affecting the chromaticity coordinates of the filters.

Enhancement of Optical and Chemical Resistance Properties with a Novel Yellow Quinophthalone Derivative for Image Sensor Colorants

“…1 H nuclear magnetic resonance (NMR) spectra were recorded on a Bruker Advance 300 spectrometer. 13 C NMR data were obtained from a 600 MHz AvanceIII-600 Bruker NMR equipped with a TCI Cryoprobe. Ultraviolet-visible (UV-Vis) optical absorption spectra were recorded using a Lambda 1050 UV-Visible spectrophotometer (Perkin Elmer, Waltham, MA, USA).…”

“…This becomes important for creating stable components in small-sized pixels. These requirements apply to all three colors—red, green, and blue—and particularly for the challenging green color, which often utilizes yellow colorant as an additive to enhance its optical characteristics [ 13 , 14 , 15 ]. The fundamental optical characteristics required for this yellow colorant include a low transmittance of 5% or less at 435 nm and a high transmittance of over 90% at 530 nm in the film state [ 16 ].…”

“…H NMR (400 MHz, DMSO-d 6 ): δ(ppm) = 14.43 (s, 1H), 8.81 (s, 1H), 8.18 (s, 2H), 8.15 (dd, J = 6.1, 3.4 Hz, 2H), 8.10 (d, J = 8.4 Hz, 1H), 8.02 (d, J = 8.2 Hz, 1H), 7.89 (t, J = 7.8 Hz, 1H), 7.62 (dd, J = 6.2, 3.2 Hz, 2H), 7.55 (t, J = 7.7 Hz, 1H) 13. C NMR (600 MHz, DMSO-d 6 ) δ 188.87, 167.41, 166.44, 163.57, 162.38, 143.82, 138.24, 135.28, 135.20, 135.16, 130.42, 129.61, 129.57, 129.51, 129.21, 129.09, 129.05, 128.42, 127.66, 125.38, 121.44, 121.39.…”