Abstract
[n]Helicene derivatives are most popular chiral structures to construct luminescent materials with circularly polarized (CP) light, which have revealed appealing application in chiral optoelectronics. Particularly, because of the unique phosphorescent emission, platinahelicene has great application prospects in CP organic light-emitting diode (CP-OLED). Herein, by decorating the pyridinyl-helicene ligand with trifluoromethyl (-CF3) unit in a specific position, a pair of platinahelicene enantiomers was prepared and separated with extremely twisted structure showing not only superior thermal and configurational stability but also good CP luminescence (CPL) property with dissymmetry factors (|gPL|) of 6 × 10−3. Moreover, the evaporated CP-OLEDs based on platinahelicene enantiomers exhibited the deep-red emission with the peak at 653 nm as well as obvious CP electroluminescence (CPEL) signals with the |gEL| in 10−3 order. Therefore, the design strategy provides an efficient way to improve the CPL properties of platinahelicene to cope with the future application in CP-OLEDs.
Highlights
In recent years, the exploration of chiral materials enabling circularly polarized (CP) light has attracted widespread attention in the field of chiral optoelectronics (Zhang et al, 2014)
Based on our design strategy we successfully prepared a new kind of platinahelicene which was further prepared evaporated CP-OLED with good performance
Thermogravimetric analysis (TGA) was performed on a Pyris 1 DSC under nitrogen at a heating rate of 10◦C min−1. (RAC)-Pt was separated by CHIRALPAK IE (IE00CD-RH008) column which was employed as stationary phase and the hexane/dichloromethane (80/20) was employed as eluent
Summary
The exploration of chiral materials enabling circularly polarized (CP) light has attracted widespread attention in the field of chiral optoelectronics (Zhang et al, 2014). In term of current research (Han et al, 2018), it is still an important way to design chiral materials with excellent CPL properties for achieving high-performance CP-OLEDs. And the degree of circularly polarized photoluminescence (CPPL) or circularly polarized electroluminescence (CPEL) is characterized by the dissymmetry factor (gPL or gEL) defined as g = 2× I /I =2 × (IL - IR)/ (IL + IR). Based on our design strategy we successfully prepared a new kind of platinahelicene which was further prepared evaporated CP-OLED with good performance In this way, PPt and M-Pt separated by (RAC)-Pt show higher gPL of −5.9 × 10−3/6.0 × 10−3.
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