Making full-color active matrix display based on quantum dot light emitting diodes(AM-QLEDs) via ink-jet printing is attractive in display industry due to QLEDs' wide color gamut and their potential manufacturing ...Making full-color active matrix display based on quantum dot light emitting diodes(AM-QLEDs) via ink-jet printing is attractive in display industry due to QLEDs' wide color gamut and their potential manufacturing advantages of large screen size and low cost. The challenges for realizing AM-QLED display are how to achieve high quality films through ink-jet printing, multi-color patterning, electroluminescence(EL) color purity, and high efficiency. Herein, a 2-inch diagonal full-color AM-QLEDs display with pixel density of 120 pixels per inch(PPI) fabricated by ink-jet printing technique is presented. Driven by a metal oxide TFT(MOTFT) back-panel, the display exhibits a maximum brightness of 400 cd m.2, and a color gamut of 109%(NTSC 1931). The red, green, and blue(RGB) monochrome QLEDs passive matrix panels fabricated by ink-jet printing technique have a current efficiency(CE) of 2.5, 13.9, and 0.30 cd A.1, respectively. To the best of our knowledge, the efficiencies are the highest among passive matrix QLEDs panels made by ink-jet printing technique. The ink-jet printed QDs films show good thickness uniformity due to high viscosity and low volatility of the printable inks, and no cross-contamination between adjacent pixels resulting from the hydrophobic pixel defining layer.展开更多
Conjugated organic polymer(COP)-based electrochromic devices(ECDs)exhibit promising applications in digital and color displays.However,fabricating COP-based ECDs integrated with excellent electrochromic performance,cu...Conjugated organic polymer(COP)-based electrochromic devices(ECDs)exhibit promising applications in digital and color displays.However,fabricating COP-based ECDs integrated with excellent electrochromic performance,customized patterns,and flexibility remains challenging.In this study,we report inkjet-printed,flexible,and patterned ECDs based on two-dimensional(2 D)polyaniline(PANI)sheets,which are evenly dispersed in formic acid(FA)enabling high-precision,stable inkjet printing.The pristine lamellar structure of PANI sheets,which combine nanoscale thickness and an appropriate doping ratio,and the additive-free ink composition endow the printed PANI electrodes and ECDs with high performance.The fabricated PANI electrode exhibits a high optical contrast(76%at a wavelength of 750 nm),a good coloration efficiency(CE)of 259.1 cm^(2) C^(-1),and a short coloration/bleaching time(1.8/2.4 s),simultaneously integrated with pseudocapacitance and mechanical flexibility.Moreover,the 2 D lamellar PANI ink developed in this study can be printed into various designed patterns,particularly for electrochemically controlled,addressable electrochromic displays.This work highlights 2 D lamellar PANI as a promising electrochromic material for flexible and patterned ECDs.展开更多
基金supported by the National Key Basic Research and Development Program of China (2015CB655004)the National Natural Science Foundation of China (U1601651, 51521002, U1301243, 61574061)the Educational Commission of Guangdong Province (2015B090914003, 2014KZDXM012)
文摘Making full-color active matrix display based on quantum dot light emitting diodes(AM-QLEDs) via ink-jet printing is attractive in display industry due to QLEDs' wide color gamut and their potential manufacturing advantages of large screen size and low cost. The challenges for realizing AM-QLED display are how to achieve high quality films through ink-jet printing, multi-color patterning, electroluminescence(EL) color purity, and high efficiency. Herein, a 2-inch diagonal full-color AM-QLEDs display with pixel density of 120 pixels per inch(PPI) fabricated by ink-jet printing technique is presented. Driven by a metal oxide TFT(MOTFT) back-panel, the display exhibits a maximum brightness of 400 cd m.2, and a color gamut of 109%(NTSC 1931). The red, green, and blue(RGB) monochrome QLEDs passive matrix panels fabricated by ink-jet printing technique have a current efficiency(CE) of 2.5, 13.9, and 0.30 cd A.1, respectively. To the best of our knowledge, the efficiencies are the highest among passive matrix QLEDs panels made by ink-jet printing technique. The ink-jet printed QDs films show good thickness uniformity due to high viscosity and low volatility of the printable inks, and no cross-contamination between adjacent pixels resulting from the hydrophobic pixel defining layer.
基金supported by the International Cooperation Fund of the Science and Technology Commission of Shanghai(19520744500)the National Natural Science Foundation of China(51903045 and 52173031)+3 种基金the Program of Shanghai Academic/Technology Research Leader(20XD1400100)the Basic Research Project of the Science and Technology Commission of Shanghai(21JC1400100)the Fundamental Research Funds for the Central UniversitiesGraduate Student Innovation Fund of Donghua University(CUSF-DH-D-2020048)。
文摘Conjugated organic polymer(COP)-based electrochromic devices(ECDs)exhibit promising applications in digital and color displays.However,fabricating COP-based ECDs integrated with excellent electrochromic performance,customized patterns,and flexibility remains challenging.In this study,we report inkjet-printed,flexible,and patterned ECDs based on two-dimensional(2 D)polyaniline(PANI)sheets,which are evenly dispersed in formic acid(FA)enabling high-precision,stable inkjet printing.The pristine lamellar structure of PANI sheets,which combine nanoscale thickness and an appropriate doping ratio,and the additive-free ink composition endow the printed PANI electrodes and ECDs with high performance.The fabricated PANI electrode exhibits a high optical contrast(76%at a wavelength of 750 nm),a good coloration efficiency(CE)of 259.1 cm^(2) C^(-1),and a short coloration/bleaching time(1.8/2.4 s),simultaneously integrated with pseudocapacitance and mechanical flexibility.Moreover,the 2 D lamellar PANI ink developed in this study can be printed into various designed patterns,particularly for electrochemically controlled,addressable electrochromic displays.This work highlights 2 D lamellar PANI as a promising electrochromic material for flexible and patterned ECDs.
