Full-Color Emission and Temperature Dependence of the Luminescence in Poly-P -Phenylene Ethynylene-ZnS:Mn2+ Composite Particles
Synthesis of a nanocomposite material composed of anionic poly (phenylene ethynylene) (aPPE) polymer particles and ZnS:Mn2+ nanoparticles is described and its luminescence properties investigated. aPPE particles have two emissions, one in the blue (460 nm), which are assigned to the 0-0 transition and an excimer, respectively. ZnS:Mn2+ nanoparticle have an emission at 596 nm which is due to the 4T1-6A1 transition of Mn2+ and an emission at 706 nm which is ascribed to a defect-related luminescence. The blue, green, yellow, and red emissions make the composite a potential material for full-color displays. More interesting, the relative intensities of the different emissions may be varied by changing the excitation energy. Photoluminescence excitation and emission spectra as well as observations on luminescence lifetimes indicate that there is negligible energy transfer from the polymer particles to the ZnS:Mn2+ nanoparticle. Temperature studies reveal that the ZnS:Mn2+ particles in the nanocomposite have a significantly reduced thermal quenching energy relative to bare ZnS: > n2+ nanoparticles. In addition, between room temperature and 90 C, the luminescence of the ZnS:Mn2+ nanoparticles at 596 nm increases in intensity with increasing temperature. This surprising phenomenon is attributed to thermoluminescence and thermal curing of the particle surface upon heating.
- Research Organization:
- Pacific Northwest National Lab., Richland, WA (US), Environmental Molecular Sciences Laboratory (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 15006087
- Report Number(s):
- PNNL-SA-38150; 2214a; KP1301030; TRN: US200412%%66
- Journal Information:
- Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical, Vol. 107, Issue 27; Other Information: PBD: 10 Jul 2003; ISSN 1089-5647
- Country of Publication:
- United States
- Language:
- English
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