Macrocrystals of Colloidal Quantum Dots in Anthracene: Exciton Transfer and Polarized Emission


Soran-Erdem Z. , ERDEM T. , Hernandez-Martinez P. L. , Akgul M. Z. , Gaponik N., Demir H. V.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS, cilt.6, ss.1767-1772, 2015 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 6 Konu: 9
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1021/acs.jpclett.5b00685
  • Dergi Adı: JOURNAL OF PHYSICAL CHEMISTRY LETTERS
  • Sayfa Sayıları: ss.1767-1772

Özet

In this work, centimeter-scale macrocrystals of nonpolar colloidal quantum dots (QDs) incorporated into anthracene were grown for the first time. The exciton transfer from the anthracene host to acceptor QDs was systematically investigated, and anisotropic emission from the isotropic QDs in the anthracene macrocrystals was discovered. Results showed a decreasing photoluminescence lifetime of the donor anthracene, indicating a strengthening energy transfer with increasing QD concentration in the macrocrystals. With the anisotropy study, QDs inside the anthracene host acquired a polarization ratio of similar to 1.5 at 0 degrees collection angle, and this increases to similar to 2.5 at the collection angle of 60 degrees. A proof-of-concept application of these excitonic macrocrystals as tunable color converters on light-emitting diodes was also demonstrated.