Abstract
Quantum dot enhancement film (QDEF) working in tandem with a blue light-emitting-diode (LED) back-light-unit (BLU) has been recently used in liquid crystal display (LCD) to minimize the cross talks between the polarized emitting B-, G-, and R-light. However, they still exhibit a fundamental and considerable emitting-light-power loss from QDEF because of the light absorption loss in resin and transparent films of QDEF. In this work, we propose and demonstrate the superiority of the LCD using blue-(B-), green-(G-), and red-(R-) perovskite-quantum-dot (PrQD) functional CFs coupled with a blue LED BLU. This LCD using PrQD functional CFs and a blue LED BLU features cross-talk free spectra of polarized emitting B-, G-, and R-light, maximizing the LCD color gamut and exhibiting a world record performance of over 102.7% (137%) of Rec.2020 standard (NTSC standard). Theoretically, such an improvement in color gamut would facilitate unlimited scaling-down of the pixel leading to super ultra-high resolution LCD.
Highlights
The CsPbX3 QDs were synthesized by adapting the synthesis process developed by Protesescu et al.14 0.814 g of Cs2CO3 was loaded into 100 mL 3-neck flask along with 40 mL of ODE (1-octadecene) and 2.5 mL of oleic acid (OA), dried for 1 h at 120 °C, and heated under N2 to 150 °C until all Cs2CO3 reacted with OA
After 1 cm × 1 cm guide-rings were attached to the quartz glass substrates, the prepared R, G, and B-CFs as a reference, Quantum dot enhancement film (QDEF) including G- and R-QDs, and the R, G, and B-color filters mixed with R, G, and B-QD solution were uniformly coated in a 1 cm[2] quartz substrate
The PrQD functional CF liquid crystal display (LCD) using a blue LED can overcome a fundamental drawback of the emitting light power loss (>10%) due to using the transparent film including the G- and R-QDs mixed resin and a blue LED BLU in the QDEF LCD
Summary
Three types of perovskite-based QDs, i.e. CsPbCl1.4Br1.6 (B-PrQD), CsPbCl0.5Br2.5 (G-PrQD), and CsPbBr0.9I2.1 (R-PrQD), were synthesized for QD-functional CFs to achieve narrow FWHM, especially, for blue and green light emissions in CF film state. These PrQDs were designed by adjusting the stoichiometric molar fraction between Cl-, Br- and I- anions to absorb the blue light of a blue LED and emit only B-, G-, and R-light via energy-down-shift[15].
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