Synthesis of Poly(N‐aryl‐2,7‐carbazole)s for Efficient Blue Electroluminescence Materials

Abstract

Several poly(N‐phenyl‐2,7‐carbazole)s that have dialkoxy groups at the m‐ and p‐positions (PmpCzDC, PmpPhDC, PmpCBiDC, PmpEHC), a silyl group at the p‐position (PpPhDSiC), and a diphenylamino group (PmPhDAC, PmEHAC) at the m‐position of the N‐phenyl portion are synthesized, and their optical properties are characterized. These polymers have been used as emitting layer materials of organic light‐emitting diode (OLED) devices that have a configuration of ITO/PEDOT(PSS)/polymer/CsF/Al. The OLED devices embedded with PmpCzDC, PmpPhDC, and PmpEHC show intense luminance of about 15 000 cd · m−2 with efficiencies of about 1 cd · A−1, while the devices embedded with PpPhDSiC, PmPhDAC, and PmEHAC show less luminance but retain the color purity of blue emission under a wide range of applied voltages.

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“…Poly(carbazole‐2,7‐diyl)s are one of the blue light‐emitting materials first reported in 2001 6. In these years, we have demonstrated that poly( N ‐arylcarbazole‐2,7‐diyl)s have good solubility in organic solvents, quantitative fluorescence quantum efficiency, good EL performance with higher luminance than 10,000 cd m −2 and maximum efficiency over 2.0 cd A −1 , and these EL results were superior to polyfluorenes and poly( N ‐alkylcarbazol‐2,7‐diyl)s 4,7. Generally, polycarbazoles have good hole‐injection ability8 and at the same time electron injection ability is low, which means balancing of carriers' injection into the emitting layer of polycarbazoles is difficult during PLED operations.…”

Synthesis of Poly(2,7‐carbazole)s and Derivatives

“…The strategy used to improve the electroluminescence properties was the modification of the substituents on the nitrogen atom. A wide variety of alkyl chains [76,90] and aryl groups [95,96,[105][106][107] have been tested to obtain highly performing materials. Recently, a new carbazole monomer bearing a sulfonate group at the end of the alkyl chain was synthesized [108].…”

Longest Tradition and Newest Trends …

“…Matthias Rehahn et al [8] Synthesis of Poly(N-aryl-2,7-carbazole)s for Efficient Blue Electroluminescence Materials Masashi Kijima et al [9] Conductive Polymer Electrolytes Derived from Poly(norbornene)s with Pendant Ionic Imidazolium…”