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![[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
Published on: May 21, 2019
Helically Chiral Tetradentate Pt(II) Emitters via Efficient Diastereoselective Synthesis for High-Performance
Kewei Xu1, Hongjian Zheng1, Chengyao Zhang1
1Center For Phosphorescent Material Research, State Key Laboratory of Green Chemical Synthesis and Conversion, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, People's Republic of China.
Abstract:
Highly efficient circularly polarized phosphorescent organic light-emitting diodes (CP-PhOLEDs) with narrowband deep-blue emission remain a formidable challenge, owing to the difficult chiral HPLC resolution, poor stability, low color purity, and limited brightness of chiral phosphorescent emitters. Herein, we report a novel central chirality adaptively induced helical chirality (CAIH) strategy for the diastereoselective synthesis of helically chiral tetradentate Pt(II) emitters. By introducing inexpensive and optically pure R-/S-amino alcohol-derived centrally chiral units into a rigid N-heterocyclic carbene (NHC)-based ligand, and using a diisopropylphenyl group to suppress intermolecular interactions, two pairs of emitters (M-/P-PtCP1 and M-/P-PtCP2) were obtained on a gram scale. These diastereomers exhibit excellent CP luminescence properties with dissymmetry factor (|gPL|= 10-3), ultrapure deep-blue emissions (λPL/FWHM ≈ 456/20 nm), photoluminescence quantum efficiency (ΦPL) values up to 99%, and high configurational stability. The M-/P-PtCP1- and M-/P-PtCP2-based devices also display distinct mirror-symmetric CPEL signals with |gEL| values of 10-4. Impressively, the P-PtCP1-based device simultaneously achieves record-high external quantum efficiency (EQE = 18.3% at 1000 cd m-2) and maximum brightness (Lmax = 19933 cd m-2) values among reported CP-OLEDs with CIEy < 0.12. This study provides valuable insight and new perspectives on the construction of stable helically chiral tetradentate Pt(II) emitters for high-performance CP-PhOLEDs.
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