Bright persistent luminescence from pure organic molecules through a moderate intermolecular heavy atom effect.

Chem Sci

State , Key Laboratory of Supramolecular Structure and Materials , College of Chemistry , Jilin University, 2699 Qianjin Street , Changchun , P. R. China . Email: ; Email:

Published: September 2017

Generally, strong phosphorescence always implies a short luminescence lifetime. So, pure organic molecules with strong persistent phosphorescence at room temperature are rarely explored. Here, a new strategy is used to explore strong persistent phosphorescence of carbazole derivatives through an intermolecular moderate heavy atom effect. Flexible alkyl chains were inserted between the heavy atom and carbazole moieties so as to avoid a strong internal heavy atom affect. The results indicate that the photoluminescence properties of crystals strongly depend on molecular stacking in crystal states. Moreover, seven molecules among eight carbazole derivatives exhibit persistent room-temperature phosphorescence in their crystals and the values of three compounds exceed 9.5%. Notably, when a 6-(4-bromophenoxy)hexyl group is linked to carbazole, the ambient phosphorescent quantum yield reaches 39.5% and the lifetime is as long as 200 ms. Moreover, it emitted white light with a luminescent efficiency of 72.6% owing to the coexistence of strong fluorescence and phosphorescence.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5625585PMC
http://dx.doi.org/10.1039/c5sc03739eDOI Listing

Publication Analysis

Top Keywords

heavy atom
16
pure organic
8
organic molecules
8
strong persistent
8
persistent phosphorescence
8
carbazole derivatives
8
strong
5
phosphorescence
5
bright persistent
4
persistent luminescence
4

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!