C-9 Fluorenyl Substituted Anthracenes: A Promising New Family of Blue Luminescent Materials

Abstract

Syntheses, optical, and electrochemical properties of novel C-9 fluorenyl substituted anthracenes linked by a tetrahedral sp(3)-hybridized carbon atom are reported for blue light emitting materials. Remarkably, an unoptimized organic light-emitting diode based on 1-fold fluorene-functionalized anthracene 3 exhibits a radiance of 4100 cd/m(2) at 12 V and a maximum EL efficiency of 1.36 cd/A with color purity CIE x, y (0.157, 0.082), which is very close to the National Television System Committee standard blue.

Theoretical Investigation of New Organic Electroluminescent Materials Based on 4-Azaindole Groups and Oligopyrrole

“…The presence of 4-azainole moieties at the end group of oligopyrrole greatly enhanced the photoluminescence by increasing the intrinsic stiffness of the polymer backbone; weaken intermolecular interaction [6][7][8]. The emission spectrum of a conjugated polymer depends basically on its π-π*band gap, which can be tailored using different structures.…”

A simple and efficient synthesis of 9-arylfluorenes via metal-free reductive coupling of arylboronic acids and N-tosylhydrazones in situ

“…Method 6). [8] Although the methods listed above prove to be effective for the synthesis of 9-arylfluorenes, certain disadvantages particularly involving a narrow substrate scope and poor functional group tolerance need to be addressed. The 9-arylfluorene scaffold is usually constructed via multi-step reactions that sometimes require the use of a strongly acidic medium or a stoichiometric amount of a Lewis acid.…”

New limb-structured blue light-emitting material comprising an anthracene core with bulky substituents at its 2, 3, 9, and 10-positions

“…To date, many fluorescent blue emitters have been reported, such as the derivatives of anthracene [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], phenylene [19,23,24], pyrene [25][26][27][28], fluorene [29][30][31][32][33][34], carbazole [35][36][37][38], triarylamine [21,41,42] as well as other aromatic hydrocarbons [39,40]. In spite of this, there is still a clear need for further improvement in terms of efficiency and color purity compared to red and green emitters.…”

“…In spite of this, there is still a clear need for further improvement in terms of efficiency and color purity compared to red and green emitters. Anthracene, owing to its unique chemical and electron-rich structure, low electronic band gap, and strong blue fluorescence, has been used as a building block for many emissive materials [5][6][7][8][9][10][11][43][44][45][46].…”