Suppressing molecular motions for enhanced room-temperature phosphorescence of metal-free organic materials

Min Sang Kwon, Youngchang Yu, Caleb Coburn, Andrew W. Phillips, Kyeongwoon Chung, Apoorv Shanker, Jaehun Jung, Gunho Kim, Kevin Pipe, Stephen R. Forrest, Ji Ho Youk, Johannes Gierschner and Jinsang Kim ()
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Min Sang Kwon: University of Michigan
Youngchang Yu: University of Michigan
Caleb Coburn: University of Michigan
Andrew W. Phillips: University of Michigan
Kyeongwoon Chung: University of Michigan
Apoorv Shanker: University of Michigan
Jaehun Jung: University of Michigan
Gunho Kim: University of Michigan
Kevin Pipe: University of Michigan
Stephen R. Forrest: University of Michigan
Ji Ho Youk: University of Michigan
Johannes Gierschner: Madrid Institute for Advanced Studies—IMDEA Nanoscience, Calle Faraday 8, Ciudad Universitaria de Cantoblanco
Jinsang Kim: University of Michigan

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract Metal-free organic phosphorescent materials are attractive alternatives to the predominantly used organometallic phosphors but are generally dimmer and are relatively rare, as, without heavy-metal atoms, spin–orbit coupling is less efficient and phosphorescence usually cannot compete with radiationless relaxation processes. Here we present a general design rule and a method to effectively reduce radiationless transitions and hence greatly enhance phosphorescence efficiency of metal-free organic materials in a variety of amorphous polymer matrices, based on the restriction of molecular motions in the proximity of embedded phosphors. Covalent cross-linking between phosphors and polymer matrices via Diels–Alder click chemistry is devised as a method. A sharp increase in phosphorescence quantum efficiency is observed in a variety of polymer matrices with this method, which is ca. two to five times higher than that of phosphor-doped polymer systems having no such covalent linkage.

Date: 2015
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DOI: 10.1038/ncomms9947

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