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Issue 38, 2018
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Twisted dendrons for highly luminescent green emissive phosphorescent dendrimers

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Abstract

A new class of twisted rigid biphenyl-based dendrons with t-butyl surface groups have been prepared and attached to a green emissive fac-tris(2-phenylpyridyl)iridium(III) core. Both singly (one dendron per ligand) and doubly (two dendrons per ligand) dendronised first generation dendrimers were prepared. In both cases the solution photoluminescence quantum yields (PLQYs) were over 10% higher than the equivalent dendrimers comprised of non-rigid biphenyl-dendrons and the same core, with the doubly dendronised compound having an almost quantitative PLQY. However, for both materials there was significant reduction in the PLQY in the solid-state indicating that while the t-butyl groups can provide a degree of solubility they do not shield the emissive core as well as surface groups such as 2-ethylhexyloxy, which have greater length. When the doubly dendronised material was blended with 4,4′,4′′-tris(carbazol-9-yl)triphenylamine the film PLQY approached that of the solution measurement and simple two-layer devices comprised of the emissive layer and an electron transport/hole-blocking layer of 1,3,5-tris(3-pyridyl-3-phenyl)benzene reached a maximum brightness of ≈10 000 cd m−2 and external quantum efficiency of 16.3%, corresponding to an out-coupling efficiency of around 20%.

Graphical abstract: Twisted dendrons for highly luminescent green emissive phosphorescent dendrimers

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Supplementary files

Article information


Submitted
15 Jul 2018
Accepted
25 Aug 2018
First published
13 Sep 2018

J. Mater. Chem. C, 2018,6, 10315-10326
Article type
Paper

Twisted dendrons for highly luminescent green emissive phosphorescent dendrimers

D. M. Stoltzfus, W. Jiang, A. M. Brewer and P. L. Burn, J. Mater. Chem. C, 2018, 6, 10315
DOI: 10.1039/C8TC03491E

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