Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 39, Pages 15773-15779Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm12549d
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Funding
- Changchun Institute of Applied Chemistry, Chinese Academy of Sciences [CX07QZJC-24]
- National Natural Science Foundation of China [50803062, 60977026]
- Science Fund for Creative Research Groups [20621401]
- 973 Project [2009CB623601]
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By attaching small amounts of highly efficient D-A-D'-type 2,1,3-benzoselenadiazole and 2,1,3-naphthothiadiazole derivatives to the side chain of a polyfluorene host, we developed two series of red polymers, PFR-xBS and PFR-xNT. By tuning the doping concentration, complete energy transfer from the PF host to the red dopant occurs. The EL spectra of these red polymers show predominantly a red emission, attributed to the dopants. Single-layer devices (ITO/PEDOT:PSS/polymer/Ca/Al) of red polymers realized pure red light with a peak at 620 nm, a luminous efficiency of 2.91 cd A(-1) and CIE coordinates of (0.62, 0.36) for PFR-10BS, and a saturated red light with a peak at 632 nm, a luminous efficiency of 3.04 cd A(-1) and CIE coordinates of (0.63, 0.35) for PFR-10NT, respectively. To the best of our knowledge, the device performance of PFR-10NT is among the best single-layer saturated red PLEDs based on fluorescent polymers.
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