Macrocrystals of Colloidal Quantum Dots in Anthracene: Exciton Transfer and Polarized Emission.
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 ~1.5 at 0° collection angle, and this increases to ~2.5 at the collection angle of 60°. A proof-of-concept application of these excitonic macrocrystals as tunable color converters on light-emitting diodes was also demonstrated.
†Departments of Electrical and Electronics Engineering, Physics, UNAM-National Nanotechnology Research Center, and Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey.
Zeliha
Z
Soran-Erdem
†Departments of Electrical and Electronics Engineering, Physics, UNAM-National Nanotechnology Research Center, and Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey.
Talha
T
Erdem
‡School of Electrical and Electronic Engineering and School of Physical and Mathematical Sciences, Nanyang Technological University, 639798, Singapore.
Pedro Ludwig
PL
Hernandez-Martinez
†Departments of Electrical and Electronics Engineering, Physics, UNAM-National Nanotechnology Research Center, and Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey.
Mehmet Zafer
MZ
Akgul
§Physical Chemistry, TU Dresden, Bergstrasse 66b, D-01062 Dresden, Germany.
Nikolai
N
Gaponik
†Departments of Electrical and Electronics Engineering, Physics, UNAM-National Nanotechnology Research Center, and Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey.|‡School of Electrical and Electronic Engineering and School of Physical and Mathematical Sciences, Nanyang Technological University, 639798, Singapore.
Hilmi Volkan
HV
Demir
colloidal quantum dots; light-emitting diodes; nonradiative energy transfer; optical anisotropy; organic semiconductor macrocrystals