Optical Properties of Crystalline Thin Films of the Organic Laser Gain Material 4,4'-Bis[(N-carbazole)styryl]biphenyl

Shu-Jen Wang*, Alexander Palatnik, Markas Sudzius, Felix Talnack, Luisa Barba, Zongbao Zhang, Darius Pohl, Ilia Lashkov, Christian Hänisch, Anton Kirch, Jörn Vahland, Marius Otte, Hans Kleemann, Stefan C.B. Mannsfeld, Sebastian Reineke, Karl Leo*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

3 Citations (Scopus)


Enhancing photoluminescence quantum yield and excellent transport associated with molecular order are important for advancing organic laser device performance. However, materials combining excellent quantum yield and transport are rare. 4,4'-Bis[(N-carbazole)styryl]biphenyl (BSB-Cz) has been heavily investigated as a promising material for laser devices. However, research on highly ordered BSB-Cz crystalline films is lacking, despite the much better transport properties to be expected. Here, we show that BSB-Cz thin-film crystals can be prepared using a simple vacuum deposition method, followed by thermal annealing. The resulting crystalline neat BSB-Cz thin films show a very high photoluminescence quantum yield of over 85% and superior optical stability compared to amorphous BSB-Cz films under intense pumping conditions. We believe that our work provides a route for advancing organic laser devices through introducing crystallinity in emitter thin films with a scalable approach.

Original languageEnglish
Pages (from-to)375–380
Number of pages6
JournalACS Applied Electronic Materials
Issue number1
Early online date21 Dec 2022
Publication statusPublished - Jan 2023

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Electrochemistry

User-Defined Keywords

  • organic crystals
  • organic thin-film crystals
  • organic semiconductors
  • amplified spontaneous emission
  • organic laser dyes
  • organic photonics


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