Room Temperature Phosphorescence Inducer

　1H-Benzo[f]indole (1) is a carbazole isomer found in trace amounts in carbazole from crude oil. Liu et al. reported that carbazole from crude oil, which contains 1, shows room temperature phosphorescence (RTP). They also showed the expression of RTP by adding small amounts of 1 to 1-free synthetic carbazole and confirmed 1 as a RTP inducer. Absorption and fluorescence properties of 1 are shown in Figure 1 and summarized in Table 1. On the other hand, as mentioned in the previous article and Figure 2, high quality carbazole (2) shows no RTP, but doping 0.5 wt% of 1 to 2 induces RTP at around 500 – 700 nm. 1 can be also used as a starting material for another RTP inducer.

Figure 1. Absorption and fluorescence of 1.

Table 1. Comparison of optical properties of 1 with carbazole.

Figure 2. Difference of emission properties of 2 and 1-doped 2.

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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