Citation: He Zihan, Li Wenbo, Chen Gan, Zhang Yongming, Yuan Wang-Zhang. Polymorphism dependent triplet-involved emissions of a pure organic luminogen[J]. Chinese Chemical Letters, ;2019, 30(4): 933-936. doi: 10.1016/j.cclet.2019.03.015 shu

Polymorphism dependent triplet-involved emissions of a pure organic luminogen

School of Chemistry and Chemical Engineering, Shanghai Key Lab of Electrical Insulation and Thermal Aging, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai 200240, China

ymzhang@sjtu.edu.cn

wzhyuan@sjtu.edu.cn

Received Date: 28 February 2019
Revised Date: 6 March 2019
Accepted Date: 7 March 2019
Available Online: 8 April 2019

Figures(5)

Polymorphism has been frequently used in tuning the singlet emissions of pure organic dyes. The modulation of triplet-involved emissions, particularly room temperature phosphorescence (RTP), however, is scarcely reported. Herein, polymorphism is reported to tune the triplet-involved emissions of 2CZBZL, a newly designed pure organic luminogen consisting of twisted benzil and two planar carbazole moieties. Other than the conventional modulation through changing molecular conformation and packing, vibration can also finely tune the triplet-involved emissions. Besides prompt fluorescence (PF), polymorph B with relatively extended conformation emits thermally activated delayed fluorescence (TADF), whereas the others (A, C-E) with similarly more twisted conformations generate predominant RTP or simultaneous DF and RTP. These results demonstrate the fascinating chance to regulate the tripletinvolved emissions through controlling conformation and vibration.
- Polymorphism,
- Room temperature phosphorescence,
- Pure organic luminogens,
- Thermally activated delayed fluorescence,
- Triplet-involved emissions
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