Electrically tunable photonic crystals from long-range ordered crystalline arrays composed of copolymer colloids

Abstract

Due to recent growing interest in mobile and e-book devices, new demand for a display with excellent outdoor readability, low power consumption, and reduced eye fatigue has led to research on reflective displays. The crystalline colloidal arrays (CCAs) composed of monodisperse copolymer colloids, investigated in this study, offer great potential for a tunable photonic crystal to be applied to the display technology, owing to its high reflectance and colour purity, as well as to the precise controllability of the photonic colour in a full visible regime. With the help of the manipulability of the particle size and the surface charge, structural colour with improved viewing angle was produced by mixing colloids with different particle sizes. In addition, the stop-band tuning mechanism under the electric field was systematically investigated.

Bioinspired Stimuli‐Responsive Color‐Changing Systems

“…Colloidal crystal arrays with a nonclose‐packed structure are a class of materials that are widely used in electrochromic (EC) devices where the lattice spacing can be changed by applying a bias voltage. Many PS‐ and SiO 2 particle‐based colloidal crystals in electrochromic systems have been studied so far . The particles' size and surface charge are the first two key factors that have to be taken into account when preparing such devices.…”

Electrically responsive photonic crystals: a review

“…20 By using concentrated suspensions of copolymer poly(methyl methacrylate)polystyrene (PMMA-PS) particles, Han et al obtained crystalline colloidal arrays that were tunable on a wide range of wavelength with low voltage. 93 In particular, the resulting structural colour, which depend on the PS and PMMA ratio and on the particle diameter and suspension concentration, can be modulated from red to blue 25 by applying a voltage lower than 3.5 V (electric field up to 0.035 V/μm).…”

Part 1 : Soap-Free Emulsion Copolymerization of Styrene with COPS-I

“…높은 표면전하와 큰 굴절률을 보유한 단분산 고분 자입자는 광결정 분야에 많은 응용이 [1][2][3][4][5][6][7][8] 기대된다. 높은 표면전하를 가지는 라텍스는 전기적 반발력에 의 해 규칙적인 삼차원적 입자 배열성과 전기 영동성을 높 이고, 고분자의 큰 굴절률은 광결정의 반사율을 증가시 킨다 [9][10][11][12][13].…”

“…높은 표면전하를 가지는 라텍스는 전기적 반발력에 의 해 규칙적인 삼차원적 입자 배열성과 전기 영동성을 높 이고, 고분자의 큰 굴절률은 광결정의 반사율을 증가시 킨다 [9][10][11][12][13]. 무유화중합은 [14][15][16][17][18] 계면활성제의 첨가없이 이온성 개시제 또는 이온성 공단량체를 [4,9,10,11,[19][20][21][22][23][24] 사용하여 단분산성이 우수하고 높은 표면전하를 갖는 고분자 미립자를 제조하는 방법으로 최근에는 광학 또는 감지기능을 갖는 새로운 콜로이드 광결정 재료 [1][2][3][4][5][6][7] 제조에 사용되고 있다.…”