Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 5, Issue 47, Pages 12547-12552Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc04634k
Keywords
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Funding
- National Key RAMP
- D Program of China [2016YFB0401001]
- National Basic Research Program of China [2014CB643802]
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A big step towards manipulating organic triplet harvesting has been taken in three N-benzoyl-carbazole regioisomeric microcrystals (L-(p,m,o)Br) which consist of a -Br group at the para (p)/meta (m)/ortho (o) positions of the phenyl ring, respectively. The manipulation is demonstrated by blue thermally activated delayed fluorescence (TADF) emission in L-pBr, blue and yellow dual room temperature phosphorescence (RTP) emissions with different lifetimes in L-mBr, and ultralong yellow RTP in L-oBr. The effect of the -Br group was verified in molecular excited electronic structures and packing modes upon crystallization. Single crystal analysis and theoretical calculations reveal that exciton structures in the L-(p,m,o)Br dimers are strongly influenced by the bromine substitution positions, leading to different ways to harvest triplet excitons. As a simple and feasible strategy, taking advantage of the substitution position effect is promising in the manipulation of organic triplet excitons to achieve multifarious applications based on triplet exciton
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