High Purity Carbazole with Excellent Optical Properties

　Carbazole is an important building block in materials science. It has been recently reported that the optical properties of carbazole can be significantly affected by trace impurities that are difficult to separate.^1,2) The validity of the optical properties of carbazole derivatives containing impurities used as raw materials has also been discussed. In view of the importance of the purity of carbazole as a starting material, TCI has commercialized 1 with excellent optical properties. 1 is free from trace impurities that affect optical properties, and its optical properties are guaranteed. For example, the absorbance edge of 1 is flat. As shown in Figure 1, conventional carbazole shows the absorbance at 350 – 400 nm and room temperature phosphorescence (RTP) at 500 – 800 due to impurities. In contrast, 1 shows no RTP at that range.

Figure 1. Comparison of absorption spectra of general carbazole and 1

Figure 2. Comparison of emission spectra of general carbazole and 1

References

• 1) Carbazole isomers induce ultralong organic phosphorescence
• C. Chen, Z. Chi, K. C. Chong, A. S. Batsanov, Z. Yang, Z. Mao, Z. Yang, B. Liu, Nat. Mater. 2021, 20, 175.
• 2) Revisiting Carbazole: Origin, Impurity, and Properties
• C. Chen, K. C. Chong, Y. Pan, G. Qi, S. Xu, B. Liu, ACS Mater. Lett. 2021, 3, 1081.

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