Efficient deep blue fluorescent OLEDs with ultra-low efficiency roll-off based on 4H-1, 2, 4-triazole cored D-A and D-A-D type emitters. (June 2018)

• Record Type: Journal Article
• Authors: Abdurahman, Alim; Obolda, Ablikim; Peng, Qiming; Li, Feng
• Is Part Of: Dyes and pigments. Volume 153(2018)
• Page Start: 10
• Page End: 17
• Publication Date: 2018-06
• Subjects: Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2018.02.002
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Four novel 4 H -1, 2, 4-triazole (TAZ)-cored D-A and D-A-D type deep blue emitters were obtained and the non-doped OLEDs employing one of them as emitters exhibited fantastic performances with maximum EQE of 6.3% and CIE coordinates of (0.158, 0.038) as well as demonstrated ultra-low efficiency roll-off. The EL spectra of the OLEDs have very narrow FWHM (full width at half maximum) of 48 nm–50 nm, which means the excellent color purity. If using the CIE(x, y) of our OLEDs as the blue point, and the green and red CIE(x, y) of NTSC (National Television System Committee) as the green and red points, the color gamut will exceed 100%, which was thought to be the unique advantage of quantum-dots-based LEDs. To the best of our knowledge, these are the best results to date for deep blue OLEDs with CIE(y) coordinate <0.04. Graphical abstract: The non-doped OLEDs exhibited fantastic performances with maximum EQE of 6.3% and CIE coordinates of (0.161, 0.034) as well as demonstrated ultra-low efficiency roll-off. Highlights: Four novel 4 H -1, 2, 4-triazole (TAZ)-cored D-A and D-A-D type deep blue emitters were obtained. The non-doped OLEDs exhibited fantastic performances with maximum EQE of 6.3% and CIE coordinates of (0.158, 0.038). The color gamuts will exceed 100%.