A series of polyfluorene (PF) electrolytes bearing Br-, BF 4-, or PF6- counterions were synthesized and characterized. 2,1,3-benzoselenadiazole moieties were incorporated into polymer main chains to produce single-component white lightemitting polymers. The thermal stability of Br-containing ionic PF was decreased because of the Hofmann elimination occurred at higher temperature. By replacing Br- with BF4- or PF6 - counterions, the thermal stability of polymers was significantly improved. The emission intensity around 550 nm was decreased for ionic polyelectrolytes. The optimized spin-coated light-emitting electrochemical cell (LEC) with the configuration of ITO/PEDOT/polymer/Ag showed a maximum luminescence efficiency of 1.56 lm/W at a low operation bias of 3 V. The single-component LEC device exhibited pure white light emission with CIE'1931 coordinates approaching (0.33, 0.33) and high color rendering index (CRI > 85), referring to its potential use in solid-state-lighting application.
|Journal||Proceedings of SPIE - The International Society for Optical Engineering|
|State||Published - 9 Dec 2013|
|Event||Organic Light Emitting Materials and Devices XVII - San Diego, CA, United States|
Duration: 25 Aug 2013 → 28 Aug 2013
- Light-emitting electrochemical cells
- Solid-state lighting