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Cyano-Substituted Oligo(p-phenylene vinylene) Single Crystals: A Promising Laser Material
- Source :
- Advanced Functional Materials. 21:3770-3777
- Publication Year :
- 2011
- Publisher :
- Wiley, 2011.
-
Abstract
- Organic crystals that combine high charge-carrier mobility and excellent light-emission characteristics are expected to be of interest for light-emitting transistors and diodes, and may offer renewed hope for electrically pumped laser action. High-luminescence-efficiency cyano-substituted oligo(p- phenylene vinylene) (CN-DPDSB) crystals (η ≈ 95%) grown by the physical vapor transport method is reported here, with high mobilities (at ≈10−2 cm2 V−1 s−1 order of magnitude) as measured by time-of-flight. The CN-DPDSB crystals have well-balanced bipolar carrier-transport characteristics (μhole≈ 2.5–5.5 × 10−2 cm2 V−1 s−1; μelectron ≈ 0.9–1.3 × 10−2 cm2 V−1 s−1) and excellent optically pumped laser properties. The threshold for amplified spontaneous emission (ASE) is about 4.6 μJ per pulse (23 KW cm−2), while the gain coefficient at the peak wavelength of ASE and the loss coefficient caused by scattering are ≈35 and ≈1.7 cm−1, respectively. This indicates that CN-DPDSB crystals are promising candidates for organic laser diodes.
Details
- ISSN :
- 1616301X
- Volume :
- 21
- Database :
- OpenAIRE
- Journal :
- Advanced Functional Materials
- Accession number :
- edsair.doi...........21b86a119cf556d221711308ccfde631