S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Electrical and Computer Engineering (전기·정보공학부) Others_전기·정보공학부
Deep Blue Light-Emitting Diodes Based on Cd1-xZnxS@ZnS Quantum Dots
- Bae, Wan Ki; Lim, Jaehoon; Char, Kookheon; Kwak, Jeonghun; Lee, Donggu; Lee, Changhee; Nam, MinKi; Lee, Seonghoon
- Issue Date
- Institute of Physics
- Nanotech. 20 075202
- We demonstrate deep blue light-emitting diodes based on chemically synthesized
Cd1−xZnxS@ZnS quantum dots (QDs). Composite films of poly-(N,N -bis(4-butylphenyl)-
N,N -bis(phenyl)benzidine) (poly-TPD) and 4,4 , N,N -diphenylcarbazole (CBP) are
employed for facilitated hole injection into Cd1−xZnxS@ZnS QDs and uniform QD deposition.
The fabricated devices possess moderate turn-on voltage (6 V) and external quantum efficiency
(0.1–0.3%), and exhibit color-saturated blue emission with a narrow spectral bandwidth of full
width at half maximum <25 nm (Commission Internationale de l’Eclairage (CIE) coordinates
of (0.169, 0.024) and (0.156, 0.028) for devices with electroluminescence (EL) λmax at 434 and
454 nm, respectively). Most of the emission originates from the Cd1−xZnxS@ZnS QD layers
(99% of the total EL emission).
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