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Intrinsic Polarization and Tunable Color of Electroluminescence from Organic Single Crystal-based Light-Emitting Devices.

Ding R, Feng J, Zhou W, Zhang XL, Fang HH, Yang T, Wang HY, Hotta S, Sun HB - Sci Rep (2015)

Bottom Line: The polarization ratio of 5:1 for the transversal-electric (TE) and transversal-magnetic (TM) polarization at the emission peak of 575 nm, and 4.7:1 for the TM to TE polarization at the emission peak of 635 nm, respectively, have been obtained.The emitting color is tunable between yellow, yellow-green and orange by changing the polarization angle.The polarized EL and the polarization-induced color tunability can be attributed to the anisotropic microcavity formed by the BP3T crystal with uniaxial alignment of the molecules.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China.

ABSTRACT
A single crystal-based organic light-emitting device (OLED) with intrinsically polarized and color-tunable electroluminescence (EL) has been demonstrated without any subsequent treatment. The polarization ratio of 5:1 for the transversal-electric (TE) and transversal-magnetic (TM) polarization at the emission peak of 575 nm, and 4.7:1 for the TM to TE polarization at the emission peak of 635 nm, respectively, have been obtained. The emitting color is tunable between yellow, yellow-green and orange by changing the polarization angle. The polarized EL and the polarization-induced color tunability can be attributed to the anisotropic microcavity formed by the BP3T crystal with uniaxial alignment of the molecules.

No MeSH data available.


Related in: MedlinePlus

The optical polarization dependence of the EL spectra and the photographs of the BP3T crystal-based OLED with different polarization. Nonpolariztion (a), (b), TE (c), (d) and TM (e), (f) polarization, respectively.
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f3: The optical polarization dependence of the EL spectra and the photographs of the BP3T crystal-based OLED with different polarization. Nonpolariztion (a), (b), TE (c), (d) and TM (e), (f) polarization, respectively.

Mentions: A contrast polarizer is applied to analyze the polarization of the EL emission. The device emits yellow light without polarizer and the EL spectrum exhibits two major peaks at 575 and 635 nm, respectively (Fig. 3a,b). Then the two EL peaks can be separated by the polarizer and described as TE and TM polarization, respectively. The polarized EL spectra from the BP3T crystal-based OLEDs are measured at normal direction to the device surface and detected through a polarizer aligned parallel or perpendicular to the crystal plane, which are corresponding to TE and TM polarization, respectively. The TE and TM polarization with the electric and magnetic component are perpendicular with the crystal surface plane4041. As the polarizer perpendicular to the crystal plane (TE polarization), the device shows yellow-green emission with the EL spectra dominated by the peak at 575 nm, while the peak of 635 nm is suppressed (Fig. 3c,d). Then the emission color can be changed to orange by tuning the polarizer parallel to the crystal plane (TM polarization), while the EL spectrum is dominated by the peak at 635 nm (Fig. 3e,f). The polarization ratio is estimated to be 5:1 for the TE to TM polarization at the spectrum peak of 575 nm, and 4.7:1 for the TM to TE polarization at the spectrum peak of 635 nm from emission, respectively.


Intrinsic Polarization and Tunable Color of Electroluminescence from Organic Single Crystal-based Light-Emitting Devices.

Ding R, Feng J, Zhou W, Zhang XL, Fang HH, Yang T, Wang HY, Hotta S, Sun HB - Sci Rep (2015)

The optical polarization dependence of the EL spectra and the photographs of the BP3T crystal-based OLED with different polarization. Nonpolariztion (a), (b), TE (c), (d) and TM (e), (f) polarization, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4513548&req=5

f3: The optical polarization dependence of the EL spectra and the photographs of the BP3T crystal-based OLED with different polarization. Nonpolariztion (a), (b), TE (c), (d) and TM (e), (f) polarization, respectively.
Mentions: A contrast polarizer is applied to analyze the polarization of the EL emission. The device emits yellow light without polarizer and the EL spectrum exhibits two major peaks at 575 and 635 nm, respectively (Fig. 3a,b). Then the two EL peaks can be separated by the polarizer and described as TE and TM polarization, respectively. The polarized EL spectra from the BP3T crystal-based OLEDs are measured at normal direction to the device surface and detected through a polarizer aligned parallel or perpendicular to the crystal plane, which are corresponding to TE and TM polarization, respectively. The TE and TM polarization with the electric and magnetic component are perpendicular with the crystal surface plane4041. As the polarizer perpendicular to the crystal plane (TE polarization), the device shows yellow-green emission with the EL spectra dominated by the peak at 575 nm, while the peak of 635 nm is suppressed (Fig. 3c,d). Then the emission color can be changed to orange by tuning the polarizer parallel to the crystal plane (TM polarization), while the EL spectrum is dominated by the peak at 635 nm (Fig. 3e,f). The polarization ratio is estimated to be 5:1 for the TE to TM polarization at the spectrum peak of 575 nm, and 4.7:1 for the TM to TE polarization at the spectrum peak of 635 nm from emission, respectively.

Bottom Line: The polarization ratio of 5:1 for the transversal-electric (TE) and transversal-magnetic (TM) polarization at the emission peak of 575 nm, and 4.7:1 for the TM to TE polarization at the emission peak of 635 nm, respectively, have been obtained.The emitting color is tunable between yellow, yellow-green and orange by changing the polarization angle.The polarized EL and the polarization-induced color tunability can be attributed to the anisotropic microcavity formed by the BP3T crystal with uniaxial alignment of the molecules.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China.

ABSTRACT
A single crystal-based organic light-emitting device (OLED) with intrinsically polarized and color-tunable electroluminescence (EL) has been demonstrated without any subsequent treatment. The polarization ratio of 5:1 for the transversal-electric (TE) and transversal-magnetic (TM) polarization at the emission peak of 575 nm, and 4.7:1 for the TM to TE polarization at the emission peak of 635 nm, respectively, have been obtained. The emitting color is tunable between yellow, yellow-green and orange by changing the polarization angle. The polarized EL and the polarization-induced color tunability can be attributed to the anisotropic microcavity formed by the BP3T crystal with uniaxial alignment of the molecules.

No MeSH data available.


Related in: MedlinePlus