Date

Place

[2-3]
09:50 ~ 10:15
Title:[Invited] Full-Color and White Electroluminescent Quantum Dot-light-Emitting Diodes
Ki-Heon Lee, Jong-Hoon Kim, Hee-Don Kang, Chang-Yeol Han, and Heesun Yang (Hongik Univ., Korea)
Abstract: We explore the solution-processed fabrication of two types of multicolored, multilayered hybrid quantum dot-light-emitting diodes (QLEDs) having a hole transport layer (HTL) of poly(9-vinlycarbazole) (PVK) and an electron transport layer (ETL) of ZnO nanoparticles (NPs). The first device consists of high-color purity CdZnS/ZnS blue (B), CdZnSeS/ZnS green (G), and CdSeS/ZnS red (R) QDs with RGB QD-mixed multilayer emitting layer (EML).?Three primary colored electroluminescence (EL) spectra are successfully obtained. This full-color QLED exhibits record-high values of 23352 cd/m2 in peak luminance, 21.8 cd/A in current efficiency, and 10.9% in external quantum efficiency (EQE). The second device is constructed with CdZnS/ZnS B and Cu-In-S (CIS)/ZnS yellow (Y) QDs having a bilayer scheme of a CIS/ZnS // CdZnS/ZnS sequence. A satisfactory bicolored white EL is attainable, specifically showing the peak EL values of 786 cd/m2 in luminance, 1.4 cd/A in current efficiency, and 0.6 % in EQE. Detailed EL performances of two types of QLEDs in regard to display versus lighting application will be presented.
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