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Synthesis of Persistent Luminescent Nanoparticles for Rewritable Displays and Illumination Applications
Published on: September 13, 2024
[Study on luminescence properties of a novel rare earth complex Eu(TTA) (2NH2-phen)3]
Guang Yan1, Fu-Jun Zhang, Zheng Xu
1Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044, China.
Abstract:
A novel rare earth complex Eu(TTA) (2NH2-phen)3 was synthesized. The Eu complex was blended with poly(N-vinylcarbazole) (PVK) in different weight ratios and spin coated into films. The photoluminescence of Eu(TTA) (2NH2-phen)3 was obtained. Multilayer devices with PVK : Eu(TTA) (2NH2-phen)3 as the active layer were fabricated, and the device structure was ITO/PVK : Eu(TTA) (2NH2-phen)3 / 2,9-dimethyl-4,-diphenyl-1, 10-phenan throline(BCP) /8-hydroxyquinoline aluminum(Alq3)/Al. The influence of Eu(TTA) (2NH2-phen)3 doping concentration on electroluminescence spectroscopy was studied. It was found that the EL spectra do not change with the doping concentration. The spectral overlapping of the emission spectrum of PVK and the absorption spectrum of Eu(TTA) (2NH2-phen)3 is very small. From the above experimental results, it can be demonstrated that the mainly mechanism of Eu(TTA) (2NH2-phen)3 EL is charge carrier directly trapped by ligand.
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When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

