Multi-Chromophore Dyes for Improving Light Stability of Electro-Fluidic Displays

Yong Deng,Dechao Ye,Yuanyuan Guo,Hongwei Jiang,Guofu Zhou

doi:10.3389/fphy.2021.737205

Yong Deng, Dechao Ye + Show 3 more

Open Access

https://doi.org/10.3389/fphy.2021.737205

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Abstract

Electro-fluidic display (EFD) is a new reflective display based on electrowetting phenomenon which is applied to the outdoor billboard. Organic dyes are the most important materials for the color gamut and reliability of the EFD devices, which are always synthesized based on mono-chromophore dye in previous work. In this paper, we report our research on azopyrazolone as the chromophore to construct a polychromic macromolecular dye system. The light stability and photo-electric properties of these new dyes are researched detailed. It is found that the light stability of multi-chromophore dyes and backflow properties are much better than corresponding mono-chromophore dye.

Highlights

Electro-fluidic display as an emerging display technology has received widespread attention [1,2,3,4]
When a voltage is applied across the polar liquid and solid, the contact angle of polar liquid on solid surface will be changed, and it obeys Young-Lippmann equation, as shown in Eq 2
Cos θV cos θ0 + ε0εrV2/2d · clg where θV is contact angle with a voltage applied, ε0 is dielectric constant in vacuum, εr is the effective dielectric constant of dielectric layer, V is electromotive force applied between solid surface and polar liquid, d is the thickness of dielectric layer

Summary

INTRODUCTION

Electro-fluidic display as an emerging display technology has received widespread attention [1,2,3,4]. Where θV is contact angle with a voltage applied, ε0 is dielectric constant in vacuum, εr is the effective dielectric constant of dielectric layer, V is electromotive force applied between solid surface and polar liquid, d is the thickness of dielectric layer. Colored oil, another critical material in electrowetting display, is not miscible with polar liquids. The crude Intermediate was purified by flash chromatography on silica gel (eluting agent: petroleum ether and ethyl acetate); yield: 81.9%; λ (max) 420 nm (in decane); IR (KBr, cm−1): 3,061.3 (Ar-H), 2,951.3(-CH3), 2,921.1(-CH2−), 2,880.1(-CH3); 1,642.9(C O), 1,582.8(Ar); 1,555.2(Ar-H), 1,521.2(Ar); 1,458.9 (-CH-); 1,379.1(-CH3); 1,257.3 (C-N-C); 817.8. 125.030, 123.560, 114.590, 109.570, 45.590, 39.450, 31.250, 29.050, 24.550, 23.050, 14.150, 10.590; MS (MALDI-TOF) (DIF)M/Z (%): 1,483.5

RESULTS AND DISCUSSION

CONCLUSION

DATA AVAILABILITY STATEMENT