Details

Autor(en) / Beteiligte

• Kwon, Min Sang
• Yu, Youngchang
• Coburn, Caleb
• Phillips, Andrew W
• Chung, Kyeongwoon
• Shanker, Apoorv
• Jung, Jaehun
• Kim, Gunho
• Pipe, Kevin
• Forrest, Stephen R
• Youk, Ji Ho
• Gierschner, Johannes
• Kim, Jinsang

Titel

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

Ist Teil von

• Nature communications, 2015-12, Vol.6 (1), p.8947-8947, Article 8947

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.