Abstract
Two light-emitting polyphenylene dendrimers with both hole and electron transporting moieties were synthesized and characterized. Both molecules exhibited pure blue emission solely from the pyrene core and efficient surface-to-core energy transfers when characterized in a nonpolar environment. In particular, the carbazole- and oxadiazole-functionalized dendrimer (D1) manifested a pure blue emission from the pyrene core without showing intramolecular charge transfer (ICT) in environments with increasing polarity. On the other hand, the triphenylamine- and oxadiazole-functionalized one (D2) displayed notable ICT with dual emission from both the core and an ICT state in highly polar solvents. D1, in a three-layer organic light emitting diode (OLED) by solution processing gave a pure blue emission with Commission Internationale de l’Éclairage 1931 CIE xy = (0.16, 0.12), a peak current efficiency of 0.21 cd/A and a peak luminance of 2700 cd/m2. This represents the first reported pure blue dendrimer emitter with bipolar charge transport and surface-to-core energy transfer in OLEDs.
Highlights
organic light emitting diode (OLED) have manifested a broad range of applications in flat-panel displays and solid-state lighting [1,2,3]
(8) which needs in turna was made in iodo-functionalized high yield (67%) by a tetraphenylcyclopentadienone (CP)
The results suggested that no intramolecular charge transfer (ICT) occurred in PYCAB similar as D1
Summary
OLEDs have manifested a broad range of applications in flat-panel displays and solid-state lighting [1,2,3]. Dendrimers for OLEDs generally include two types: one designed for better charge transport (conjugated scaffold) [14,15,16,17,18,19]. One for surface-to-core energy transfers (non-conjugated scaffold) [20,21,22,23,24]. For this purpose, shape-persistent polyphenylene dendrimers enable generation-by-generation (core-shell-surface) functionalization and OLEDs utilizing efficient surface-to-core energy transfers. Shape-persistent polyphenylene dendrimers enable generation-by-generation (core-shell-surface) functionalization and OLEDs utilizing efficient surface-to-core energy transfers For this purpose, shape-persistent polyphenylene dendrimers enable generation-by-generation of pyrene-cored polyphenylene dendrimers have been efficient reportedsurface-to-core [22,23,24]. PYNPA functionalization and OLEDs utilizing transfers of
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