Highly efficient stable blue organic light-emitting diodes based on a novel anthracene[2,3-b]benzofuran framework

Abstract Abstract Organic blue fluorescent emitters emissions are highly desirable for high-resolution organic light-emitting diode (OLED) display technology. In this work, a design strategy for realizing narrowband emission of organic blue fluorescent emitters by connecting carbazole and amine named ABFCz and ABFAn, respectively, with anthracene [2,3-b] benzofuran as rigid groups was reported for the first time. The developed materials can achieve high efficiency and long life. Studies of doped devices have shown that, ABFCz-based blue emitting OLEDs achieve a maximum current efficiency of 6.96 cd/A with a narrow full width at half maximum (FWHM) of 44 nm, as well as a Commission Internationale de l’Eclairage (CIE) coordinate of (0.15, 0.14) and the maximum external quantum efficiency (EQEmax) of 7.7% is achieved. While the ABFAn emitter-based devices exhibit blue emission with a maximum current efficiency of up to 9.20 cd/A (EQEmax of 11.4%) with a FWHM of 44 nm, as well as a CIE coordinate of (0.14, 0.13). The devices base on ABFAn operating lifetime test LT90 (luminance decays to 90% of the initial brightness) of 202 hours at an initial luminance of 1,000 cd/m2. The results show that anthracene[2,3-b]benzofuran can be modified with a higher glass transition temperature (Tg) to achieve high-efficiency and stable operating lifetime blue light devices. Our work may provide a new approach for designing high-efficiency blue materials.