Abstract
We report on the temperature dependence of the polarized photoluminescence (PL) exhibited by crystalline organic rubrene sheets with a thickness of ∼60 nm. To probe the correlations between the electronic states and the molecular stacking of rubrene molecules, the polarized PL spectrum of a single rubrene sheet was analyzed as a function of temperature from 10 to 250 K. Drastic changes were observed in PL peak positions and intensities ∼100 and ∼170 K, which were likely related to variations in molecular ordering with temperature. The changes in the PL characteristics of the sheet ∼170 K are similar to those observed for rubrene bulk crystals, in terms of the enhancement of mobility and crystallinity. In addition, ∼100 K, the reversal of the relative ratio of PL intensities corresponding to two crystalline axes, a and b, in the rubrene sheets suggested an anisotropic variation in the molecular ordering along these two crystalline axes.
| Original language | English |
|---|---|
| Article number | 075416 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 86 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 2012 Aug 7 |
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ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Polarized photoluminescence characteristics of rubrene sheets with nanometer thickness. / Lee, Jin Woo; Jo, Seong Gi; Joo, Jinsoo; Kim, Jin Heung; Rho, Heesuk.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 86, No. 7, 075416, 07.08.2012.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Polarized photoluminescence characteristics of rubrene sheets with nanometer thickness
AU - Lee, Jin Woo
AU - Jo, Seong Gi
AU - Joo, Jinsoo
AU - Kim, Jin Heung
AU - Rho, Heesuk
PY - 2012/8/7
Y1 - 2012/8/7
N2 - We report on the temperature dependence of the polarized photoluminescence (PL) exhibited by crystalline organic rubrene sheets with a thickness of ∼60 nm. To probe the correlations between the electronic states and the molecular stacking of rubrene molecules, the polarized PL spectrum of a single rubrene sheet was analyzed as a function of temperature from 10 to 250 K. Drastic changes were observed in PL peak positions and intensities ∼100 and ∼170 K, which were likely related to variations in molecular ordering with temperature. The changes in the PL characteristics of the sheet ∼170 K are similar to those observed for rubrene bulk crystals, in terms of the enhancement of mobility and crystallinity. In addition, ∼100 K, the reversal of the relative ratio of PL intensities corresponding to two crystalline axes, a and b, in the rubrene sheets suggested an anisotropic variation in the molecular ordering along these two crystalline axes.
AB - We report on the temperature dependence of the polarized photoluminescence (PL) exhibited by crystalline organic rubrene sheets with a thickness of ∼60 nm. To probe the correlations between the electronic states and the molecular stacking of rubrene molecules, the polarized PL spectrum of a single rubrene sheet was analyzed as a function of temperature from 10 to 250 K. Drastic changes were observed in PL peak positions and intensities ∼100 and ∼170 K, which were likely related to variations in molecular ordering with temperature. The changes in the PL characteristics of the sheet ∼170 K are similar to those observed for rubrene bulk crystals, in terms of the enhancement of mobility and crystallinity. In addition, ∼100 K, the reversal of the relative ratio of PL intensities corresponding to two crystalline axes, a and b, in the rubrene sheets suggested an anisotropic variation in the molecular ordering along these two crystalline axes.
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U2 - 10.1103/PhysRevB.86.075416
DO - 10.1103/PhysRevB.86.075416
M3 - Article
VL - 86
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 7
M1 - 075416
ER -