Optical Characterization of Functional Materials for Improved Light Emitting Devices
Ricardo M. R. Adão a, Udayabhaskararao Thumu a, Bruno Romeira a, Yury V. Kolen’ko a, Tangyou Sun a, Jana B. Nieder a
a INL International Iberian Nanotechnology Laboratory, Braga, 4715-330 Braga, Portugal
NIPHO
Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
Perovskite Photonics and Optoelectronics (PEROPTO18). 1st March
Rennes, France, 2018 February 27th - March 1st
Organizers: Jacky Even and Sam Stranks
Poster, Ricardo M. R. Adão, 118
Publication date: 11th December 2017

Light Emitting Diodes (LEDs) are revolutionary low energy consumption light sources that entered our everyday life, as they are capable of reducing world’s lighting energy requirements by more than 75%. Additionally they trigger new devices and applications, ranging from transparent displays,1 to optical communication and computing with integrated photonic devices. LED technology can further be improved by engineering its spectral and efficiency properties. Here we present several state-of-the-art nanotechnology and photonics-based approaches that we employ in the framework of functionalization of LEDs with optical active nanomaterials such as Perovskites and Quantum Dots (QDs).2 Furthermore, surface structuring techniques for enhanced out-coupling of radiation3 shall be employed using available advanced 3D nanostructuring techniques, such as femtosecond laser ablation, two-photon polymerization or nanoimprinting. The improved integration via miniaturization at the nanoscale shall ultimately increase the LED versatility and empower new applications.

In this work we study the optical properties of active nanomaterials including colloidal perovskites and Quantum Dots (QD) embedded in different polymer matrices towards stable integration in organic/inorganic nanophotonic LEDs.4 Particularly the dry deposition steps of inorganic layers process are limiting factors. We perform structural and optical characterization of synthetized colloidal CsPbBr3 perovskites using Transmission Electron Microscopy (TEM) and spectrally-resolved confocal fluorescence microscopy imaging. Also, we perform advanced optical characterization of colloidal CdSe/ZnS QD embedded in different polymer matrices using spectrally-resolved confocal fluorescence microscopy, Fluorescence Lifetime Imaging Microscopy (FLIM) and spectrally-correlated streak imaging. Ultimately, we design and fabricate an all-inorganic Alternated Current (AC) LED chip with CdSe/ZnS QD active layer.

Using the advanced optical information for the integrated optical active materials, we provide routes for optimization of LED design and fabrication.

 

 

1.          Choi, M. K. et al. Extremely Vivid, Highly Transparent, and Ultrathin Quantum Dot Light-Emitting Diodes. Adv. Mater. 1703279, 1703279 (2017).

2.          Song, J. et al. Quantum Dot Light-Emitting Diodes Based on Inorganic Perovskite Cesium Lead Halides (CsPbX3). Adv. Mater. 27, 7162–7167 (2015).

3.          Gong, Z. et al. InGaN micro-pixellated light-emitting diodes with nano-textured surfaces and modified emission profiles. Appl. Phys. A Mater. Sci. Process. 103, 389–393 (2011).

4.          Fu, Y., Kim, D., Moon, H., Yang, H. & Chae, H. Hexamethyldisilazane-mediated, full-solution-processed inverted quantum dot-light-emitting diodes. J. Mater. Chem. C 5, 522–526 (2017).

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