Optimization of the luminescence efficiencies in solution-processed phosphorescent dendrimers

Jean Charles Ribierre, Stuart G. Stevenson, Ifor D.W. Samuel, Sarah V. Staton, Paul L. Burn

研究成果: ジャーナルへの寄稿学術誌査読

16 被引用数 (Scopus)

抄録

We demonstrate that photoluminescence (PL) quantum yield and PL lifetime of fac-tris(2-phenylpyridyl) iridium(III) [Ir(ppy)3]-cored dendrimers in neat film and dispersed into a 4,4′-bis(]V-carbazoly])bipheny] host can be significantly improved by a simple adjustment of the solution preparation. Quenching of the PL in these materials is due to an energy transfer of the triplet excitons to less-emissive sites and can be reduced by blending the phosphorescent molecules into a suitable wide energy gap host or by increasing the number of attached dendrons. We show here that the concentration of these quenchers can also be controlled by changing the time spent by the dendrimer solution under illumination prior to spin-coating. By optimizing the film preparation procedure, the external efficiency of devices made from neat dendrimer films was increased from 2% to 10%.

本文言語英語
ページ(範囲)233-237
ページ数5
ジャーナルIEEE/OSA Journal of Display Technology
3
2
DOI
出版ステータス出版済み - 6月 1 2007

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学

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