Color‐by‐Blue QD‐Emissive LCD Enabled by Replacing RGB Color Filters with Narrow‐Band GR InP/ZnSeS/ZnS QD Films

Abstract

Color‐by‐blue quantum dot (QD)‐emissive liquid‐crystal displays (LCDs) with eco‐friendly, green, red (GR) InP/ZnSeS/ZnS QD films are introduced to overcome the disadvantages of conventional color‐by‐white color filter (CF)‐assisted LCDs, such as a narrow viewing angle, low external device efficiency of these types of LCDs, and a restricted color gamut. In this study, the color‐by‐blue InP‐based QD‐emissive LCD consists of a blue (B) light‐emitting diode (LED) and GR InP‐based QD films sandwiched between a light recycling filter and a long‐wavelength pass dichroic filter. The GR InP‐based QDs are synthesized with a high photoluminescence quantum yield (>77%) and narrow bandwidth (<40 nm), which are suitable for display applications. The overall enhancement of InP‐based QD‐emissive LCDs, in this case by the enhanced efficiency of a blue LED backlight transmitted through the LC shutter compared to a white LED backlight and the improved efficiency of the enlarged color gamut, is 2.42 times that of a conventional red, green, and blue (RGB) CF‐LCD with a GR phosphor‐converted (pc)‐LED (a B LED + R K2SiF6:Mn + G β‐SiAlON:Eu phosphor) backlight. Therefore, this considerable enhancement of the external efficiency of a QD‐emissive LCD makes it more feasible as a replacement for conventional RGB CF‐assisted LCDs.

54.5: Wide Viewing Angle Vertical Alignment Photoluminescent LCD

“…The next revolution is to move the QD layer to the top of the LCD to make it an emissive display. This QD layer with RGB pixels will replace the conventional color filter and becomes a quantum dot color filter (QDCF) layer [9] [10]. Higher light conversion efficiency and larger color gamut are expected.…”

Chemical Synthesis and Applications of Colloidal Metal Phosphide Nanocrystals

“…That means there is still more room for improvement and optimization. Moreover, replacing red, green, blue (RGB) color filters with narrow-band green, red InP/ZnSeS/ZnS QD films in color-by-blue QD-emissive liquid-crystal displays (LCDs) results in 1.49 times greater in the relative luminance levels, 2.42 times higher in EQE values than conventional color filter (CF)-LCD, making it possible to replace conventional RGB CF-assisted LCDs (Kang et al, 2018).…”

P‐67: Printed Reflective Sloped Wall for Enhancing Luminance of ColorConversion Light Source

“…Ultraviolet (UV) curable polymer (NOA 61, Norland Products) and QD/toluene solution were mixed with a volume ratio of 1:9, followed by 24 h stirring at 600 rpm. The reason why we select NOA 61 as a polymer matrix material is that it enables the encapsulation of QD and has high transparency, thermal stability and good miscibility with QD/toluene solution [13]. The mixed QD/NOA 61 solution was placed on the hot plate set at 70 ℃ for 30 min to evaporate residual toluene.…”