Blue light-emitting diodes from 2-(10-naphthylanthracene)-spiro[fluorene-7,9′-benzofluorene] host material

Deep Blue Fluorescent Host Materials Based on a Novel Spiro[benzo[c]fluorene-7,9'-fluorene] Core Structure with Side Aromatic Wings

“…Many studies have addressed the use of SBFFs as organic electroluminescent host materials, and it has been established that the performances of OLEDs (i.e., color purity and luminescence efficiency) based on SBFF are determined by the positions of substituents, aryl moiety type and conjugation chain length. [9][10][11][12][13][14][15][16][17] In this work, a novel SBFF core structure with aromatic side wings was developed as a highly fluorescent deep blue host material with good thermal/morphological stability and the physical properties. Three new deep blue host materials, namely 5,9-di(naphthalen-2-yl)spiro -fluorene]-5,9-diamine (TPA-SBFF) were prepared as previously described.…”

Synthesis of New Spiro[benzo[c]fluorene-7,9'-fluorene] Dimers and Their Optical Properties

“…Furthermore, isolation of the pi electron conjugated system, high solubility, and suppression of excimer formation as used solid-state fluorescent dye. Spiro-type derivatives containing fluorene and benzofluorene as OLED fluorescent materials have received a great deal of attention because asymmetrical spiro compounds with a naphthalene group not only can preserve the inherent characteristics of a spiro compound such as morphological stability, high glass transition temperature, and amorphous properties but also provide a variety of substituents on the aromatic ring of spiro molecule resulting in the formation of conjugation controlled OLED host and dopant materials, [14][15][16][17][18][19][20][21][22][23][24] In this study, we report the synthesis of novel spiro[benzo-[c]fluorene-7,9'-fluorene] (SBFF)-type OLED materials using the Suzuki reaction. Various properties such as UV-Vis absorption, photoluminescence (PL), photoelectron spectroscopy, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) were evaluated.…”

New Fluorescent Blue OLED Host and Dopant Materials Based on the Spirobenzofluorene

“…Therefore, blue fluorescent material is still of prime importance for application in full-color flat-panel displays. To date, several derivatives of anthracene, 15 binaphthol, 16,17 spirobifluorene-linked bianthracene, [18][19][20][21] and spirofluorenebenzofluorene [22][23][24][25][26][27][28][29] have been developed and subsequent attempts were made to improve their electroluminescent (EL) properties.…”