Synthesis and luminescent property of fluorene-xanthene derivatives for new blue emitters

Abstract

We have synthesized blue emitting compounds, DBI-SFX and SBF-SFX, by incorporating fluorene-9,9'-xanthene as main chromophore and introducing 1,2-diphenyl-1H-benzoimidazole and spirobi[fluorene] group. 1,2-Diphenyl-1H-benzoimidazole, 9,9’-spirobi[fluorene], and fluorene-9,9’-xanthene moieties were used to synthesize new blue emitters. The optical properties of synthesized materials were measured. Both materials emit real blue photoluminescence in the film state and SBF-SFX showed relatively high PLQY value. The synthesized materials were applied as EML in non-doped devices, and SBF-SFX had a current efficiency of 1.19cd/A, a power efficiency of 0.39lm/W and an external quantum efficiency of 1.10%, which is more than two times as high as that of DBI-SFX.

Keywords:

• OLEDs
• spirobi[fluorene]
• benzoimidazole
• xanthene

Acknowledgement

This research was supported by National R&D Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Science & ICT (No. 2017M3A7B4041699).

Additional information

Funding

This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education(No. 2017R1D1A1A09082138)