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Color-by-blue display using blue quantum dot light-emitting diodes and green/red color converting phosphors

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Abstract

We report a novel full-color display based on the generation of full-color by a highly efficient blue QD-LED light approach, or so called color-by-blue QD-LED display. This newly proposed color-by-blue QD-LED display combines a blue CdZnS/ZnS QD-LED blue subpixel and excitation source with front-emitting green/red phosphor subpixels. It is carefully estimated that the detailed display characteristics as well as full color-conversion and reasonable device efficiency of blue, green, and red satisfy the minimum requirements for display application. Also, we would like to emphasize that the proposed blue, green, and red device shows maximum luminance of 1570, 12920, and 3120 cd/m2, respectively, luminous efficiency of 1.5, 12.1, and 2.5 cd/A, respectively, and external quantum efficiency of 6.8, 2.8, and 2.0%, respectively. It is expected that full color generation by color-by-blue QD-LED will lead to further technological advancements in the area of efficient and facile display applications.

© 2014 Optical Society of America

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Figures (6)

Fig. 1
Fig. 1 Light pathway of (a) conventional (glass), (b) LPDF-capped, (c) SPDF-inserted, and (d) SPDF/LPDF-assisted phosphor film.
Fig. 2
Fig. 2 (a) Schematic diagram of the basic structure of the color-by-blue QD-LED. (b) The transmittance spectra of LPDF and SPDF. (c) Normalized EL spectrum of a blue-emitting CdZnS/ZnS QD-LED and normalized PL spectra of green (SrGa2S4:Eu) and red ((Sr,Ca)AlSiN3:Eu) phosphor films.
Fig. 3
Fig. 3 The PL spectra of the conventional (glass), LPDF-capped, SPDF-inserted, and SPDF/LPDF-assisted (a) green phosphor film and (b) red phosphor film at low phosphor concentration (20 wt%). The 1931 CIE color coordinates of the conventional (glass), LPDF-capped, SPDF-inserted, and SPDF/LPDF-assisted (c) green phosphor film and (d) red phosphor film at low phosphor concentration (20 wt%).
Fig. 4
Fig. 4 (a) Luminance and (b) conversion efficiency of four types of green phosphor films at low (20wt%) and high (50wt%) phosphor concentrations at 10V. (c) Luminance and (d) conversion efficiency of four types of red phosphor films at low (20wt%) and high (40wt%) phosphor concentrations at 10V.
Fig. 5
Fig. 5 The emission spectra and photographs of eight different steps of the creation of (a) a SPDF-coated blue QD-LED, (b) the SPDF/LPDF-assisted green phosphor film and (c) SPDF/LPDF-assisted red phosphor film as a function of the applied voltage. (d) The 1931 CIE color coordinates and color gamut measured from the national television standard committee (NTSC) as well as the color coordinates of the SPDF/LPDF-assisted green and red phosphor layers and blue emission through the SPDF-coated QD-LED.
Fig. 6
Fig. 6 The voltage-dependent variations of the luminance and current density of a blue QD-LED and SPDF/LPDF-assisted green and red color conversion phosphor films excited and controlled by blue QD-LEDs. (a) Luminance, (b) current density, (c) luminous efficiency and (d) external quantum efficiency.

Equations (2)

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IQE   ( % ) =   number   of   emitted   photons number   of   absorbed   photons   × 100   .
EQE   ( % ) =   number   of   emitted   electrons number   of   injected   electrons   × 100.
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