1. D.J. Gaspar and E. Polikarpov, OLED Fundamentals, Materials, Devices, and Processing of Organic Light-Emitting Diodes (CRC Press, Boca Raton, 2015).
2. Z.R. Li, Organic Light-Emitting Materials and Devices, 2nd edn. (CRC Press, Boca Raton, 2015).
3. C.W. Tang, S.A. VanSlyke, Appl. Phys. Lett. 51, 913 (1987)
4. S.-J. Zou, Y. Shen, F.-M. Xie, J.-D. Chen, Y.-Q. Li, J.-X. Tang, Mater. Chem. Front. 4, 788 (2020)
5. H. Ishii, K. Sugiyama, E. Ito, K. Seki, Adv. Mater. 11, 605 (1999)