2-(2-tert-Butyl-6-((E)-2-(2,6,6-trimethyl-2,4,5,6-tetrahydro-1H-pyrrolo[3,2,1-ij]quinolin-8-yl)vinyl)-4H-pyran-4-ylidene)malononitrile (DCQTB) is designed and synthesized in high yield for application as the red-light-emitting dopant in organic light-emitting diodes (OLEDs). Compared with 4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7,-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB), one of the most efficient red-emitting dopants, DCQTB exhibits red-shifted fluorescence but blue-shifted absorption. The unique characteristics of DCQTB with respect to DCJTB are utilized to achieve a red OLED with improved color purity and luminous efficiency. As a result, the device that uses DCQTB as dopant, with the configuration: indium tin oxide (ITO)/N,N′-bis(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB; 60 nm)/tris(8-quinolinolato) aluminum (Alq₃):dopant (2.3 wt %) (7 nm)/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP; 12 nm)/Alq₃(45 nm)/LiF(0.3 nm):Al (300 nm), shows a larger maximum luminance (L_max = 6021 cd m^–2 at 17 V), higher maximum efficiency (η_max = 4.41 cd A^–1 at 11.5 V (235.5 cd m^–2)), and better chromaticity coordinates (Commission Internationale de l'Eclairage, CIE, (x,y) = (0.65,0.35)) than a DCJTB-based device with the same structure (L_max = 3453 cd m^–2 at 15.5 V, η_max = 3.01 cd A^–1 at 10 V (17.69 cd m^–2), and CIE (x,y) = (0.62,0.38)). The possible reasons for the red-shifted emission but blue-shifted absorption of DCQTB relative to DCJTB are also discussed.

中文翻译：

---

用于高性能有机电致发光器件的DCM型红荧光掺杂剂^†

2-（2-叔丁基-6-（（E）-2-（2,6,6-三甲基-2,4,5,6-四氢-1 H-吡咯[3,2,1- ij ]以高收率设计并合成了喹啉-8-基）乙烯基）-4 H-吡喃-4-亚烷基）丙二腈（DCQTB），用作有机发光二极管（OLED）中的红色发光掺杂剂。与4-（二氰基亚甲基）-2-叔丁基-6-（1,1,7,7，-四甲基甲氧烷基-9-烯基）-4 H相比-pyran（DCJTB）是最有效的发红光掺杂剂之一，DCQTB表现出红移荧光但吸收蓝移。利用DCQTB相对于DCJTB的独特特性来实现具有改善的色纯度和发光效率的红色OLED。结果，使用DCQTB作为掺杂剂的器件，其配置为：铟锡氧化物（ITO）/ N，N'-双（1-萘基）-N，N'-联苯-1,1'-联苯-4 ，4'-二胺（NPB; 60 nm）/三（8-喹啉基）铝（Alq ₃）：掺杂剂（2.3 wt％）（7 nm）/ 2,9-二甲基-4,7-二苯基-1,10 -菲咯啉（BCP; 12 nm）/ Alq ₃（45 nm）/ LiF（0.3 nm）：Al（300 nm），显示出更大的最大亮度（L _max = 6021 CD米^-2在17 V），较高的最大效率（η_最大 = 4.41光盘^-1 11.5 V（235.5 CD米^-2 ）），以及更好的色度坐标（委员会国际照明，CIE，（X，ÿ）=（0.65,0.35））比具有相同结构的基于DCJTB设备（大号_最大 = 3453 CD米^-2 15.5 V，η_最大 = 3.01光盘^-1在10 V（17.69 CD米^{- 2}），CIE（x，y）=（0.62,0.38））。还讨论了DCQTB相对于DCJTB红移发射而蓝移吸收的可能原因。