Color‐by‐Blue: A novel method to achieve full‐color inorganic EL displays

Abstract

A new method for achieving full-color capability for inorganic EL displays was developed, which combines electroluminescence with photoluminescence phenomena in the same device structure. In this display panel, the blue emission was obtained from the EL device by using the Eu-doped barium thioaluminate phosphor material system, which was then used to generate green and red emission by the use of down-conversion materials. The major advantages of the Color-by-Blue method (CBB) are the elimination of color-balance control issues associated with the use of different electroluminescent phosphor materials for red, green, and blue with potentially different threshold voltages for the onset of luminance and the achievement of a low-cost high-yield manufacturing process.

Glycothermal Synthesis of Scheelite-Type LiEuW2O8 Nanophosphors and Their Structural Characterization

“…4,5) The above-mentioned optical properties are expected to be applied to numerous optical devices such as solid-state light-emitting devices combined with blue or ultraviolet LEDs and electroluminescence displays with a light conversion system such as Color by Blue. 6) LEW was produced from metal oxides by a conventional solid-state reaction at 900 -1000 C. 2) LiLa(MoO 4 ) 2 was synthesized from the alkoxides of each metal by a sol-gel method, followed by calcination at 600 C. 7) Scheelite-type NaLa(WO 4 ) 2 :RE 3þ (RE ¼ Eu, Er, and Nd) were prepared by a hydrothermal reaction at 180 C, where the primary particles were about 1-2 mm in diameter. 8) Recently, nanophosphors have attracted much attention for their use in various applications such as biolabeling, transparent optical color converters, and invisible optical applications.…”

A 34-inch Flat-Panel TV Fabricated by Combining Inorganic EL and Color-Conversion Technologies

“…The thick dielectric layer consists of material with high dielectric constant and thickness of about 10 µm. It can drastically reduce the generation of electrical breakdowns and manufacturing cost.Luminance efficacy of TDEL was found to be much higher than that of TFEL4) . Furthermore, since the thick dielectric has high dielectric constant to distribute the applied voltage much more on to the light-emitting phosphor layer, the TDEL can operate at lower voltage, reducing power requirements.…”

“…We developed a new display architecture, which is called "Color by Blue", or CBB, structure 4) to simplify the manufacturing process. In the CBB device structure, only the blue phosphor was used to generate light.…”

Inorganic EL devices with high‐performance blue phosphor and application to 34‐in. flat‐panel televisions

“…panels with wide color gamut by combining an EL structure with a thick dielectric layer (TDEL) and "Color by Blue" techniques. [3][4][5] A new display architecture, which is referred to as "Color by Blue" or CBB structure, only has a blue phosphor. The blue emission is converted into green and red through the use of color-conversion materials.…”