Date

Place

Room H (Room Hall 1, 1F)
P1. Poster Session I
August 20, 2015 (Thursday)
14:00 ~ 15:30

[P1-12]
14:00 ~ 15:30
Title:Transparent Cd-Free Quantum Dots Light Emitting Diodes with Inorganic Oxide Charge Transport Layers
Hee Yeon Kim, Yu Jin Park, Byungwook Yoo, Jiwan Kim, Gun Wook You, Chul Jong Han, Sung Ho Lee, Myo Jung Choi (KETI, Korea), Christian Ippen, Armin Wedel (Fraunhofer Inst. for Applied Polymer Research, Germany), Byeong-Kwon Ju (Korea Univ., Korea), and Min Suk Oh (KETI, Korea)
Abstract: ?Colloidal quantum dots (QDs) for the display industry have held the limelight as one of the potential technologies because of the color tunability, the narrow full width half maximum (FWHM) and the solution-process.?For the commercialization, we need the eco-friendly (Cd-free) QDs and many development about the Cd-free QDs have been done until now and the properties of these QDs are coming close to those of QDs including toxic materials. And these QDs materials can be transparent in the visible region, we can fabricated the transparent QD-LED using eco-friendly QDs. But, since it is not easy to realize the transparent electrode on the organic charge transport layer without damage, we need to develop the transparent electrode on the organic materials.?In this work, we have fabricated QD-LED devices using eco-friendly InP QDs as emission layer and inorganic TiO2 as electron transport layer with inverted structure. And, through the optimization of process parameter for transparent electrode, we could realize the transparent QD-LED with top and bottom emssion simultaneaously. We could also enhance the properties of devices by post-treatment of charge transport layer that was coated with nano-size TiO2 solution. To realize the transparent devices, we used MoOx layer as hole injection layer and protecion layer of organic HTL. Because of the non-thermal post-treatment, we could fabicate our device at low temperature of ~ 150 oC.
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