Five phenylphosphine oxide-containing polymers (PBCPO (poly(bis-(4-(N-carbazolyl)phenyl)-phenylphosphine oxide)), P(BCPO-co-ProD-Me₂), P(BCPO-co-ProD-Et₂), P(BCPO-co-ProD-Bz₂), and P(BCPO-co-ProD)) are electrodeposited on indium tin oxide (ITO) coated glass slide and their electrochromic performances are characterized. The optical band gap of PBCPO is 3.14 eV. P(BCPO-co-ProD-Bz₂) attains a high transmittance change (ΔT = 55% at 740 nm) and shows multicolored electrochromism from light tan (0.0 V), grayish-green (0.4 V), greenish-gray (1.1 V) to deep gray (1.2 V). Electrochromic devices (ECDs) containing phenylphosphine oxide-based polycarbazoles and poly(3,4-ethylenedioxythiophene) (PEDOT) as active electrode layers are constructed. PBCPO/PEDOT ECD displays light gray, gray, and greenish-gray at 0.0, 0.8, and 1.9 V, respectively. P(BCPO-co-ProD-Bz₂)/PEDOT ECD displays a high optical contrast (ΔT = 42.5% at 630 nm) and P(BCPO-co-ProD)/PEDOT ECD shows a high coloration efficiency (η = 454.1 cm²•C⁻¹ at 630 nm). In addition, P(BCPO-co-ProD derivatives)/PEDOT ECDs have adequate optical memories and long-term redox cyclic stability.

Background: Polycarbazoles can create considerably stable radical cations (polarons) and dications (bipolarons) when increasing potentials or doping chemicals. Moreover, carbazole and phenylphosphine oxide are donor (D) and acceptor (A) units in BCPO, respectively. The incorporation of phenylphosphine oxide in polycarbazoles gives rise to the improvement of charge balances and carrier mobilities. It is interesting to investigate the absorption spectra and multicolored electrochromisms of five phenylphosphine oxide-containing polycarbazoles and their corresponding ECDs upon undergoing a redox process.

Methods: A series of phenylphosphine oxide-containing anodic polymers (PBCPO, P(BCPO-co-ProD-Me₂), P(BCPO-co-ProD-Et₂), P(BCPO-co-ProD-Bz₂), and P(BCPO-co-ProD)) are electrodeposited on ITO coated glass. The absorption spectra, color variations, response time, and long-term electrochemical stability of PBCPO/PEDOT, P(BCPO-co-ProD-Me₂)/PEDOT, P(BCPO-co-ProD-Et₂)/PEDOT, P(BCPO-co-ProD-Bz₂)/PEDOT, and P(BCPO-co-ProD)/PEDOT ECDs are investigated comprehensively.

Significant findings: The as-prepared phenylphosphine oxide-containing polycarbazoles exhibit multicolored electrochromism and high transmittance change (ΔT = 55% at 740 nm), which provide new structural insights to develop new generation electrochromic electrodes.

五种含苯基氧化膦的聚合物（PBCPO（聚（双-（4-（N-咔唑基）苯基）-苯基氧化膦）），P（BCPO- co -ProD-Me ₂），P（BCPO- co -ProD-Et ₂ )、P(BCPO - co -ProD-Bz ₂ )和P(BCPO- co- ProD))被电沉积在氧化铟锡(ITO)涂层的载玻片上，并表征了它们的电致变色性能。PBCPO 的光学带隙为 3.14 eV。P(BCPO - co -ProD-Bz ₂ ) 获得高透光率变化 (Δ T = 55% 在 740 nm）并显示从浅棕褐色 (0.0 V)、灰绿色 (0.4 V)、绿灰色 (1.1 V) 到深灰色 (1.2 V) 的多色电致变色。构建了包含基于氧化苯膦的聚咔唑和聚（3,4-亚乙基二氧噻吩）（PEDOT）作为活性电极层的电致变色器件（ECD）。PBCPO/PEDOT ECD 分别在 0.0、0.8 和 1.9 V 时显示浅灰色、灰色和绿灰色。P(BCPO- co -ProD-Bz ₂ )/PEDOT ECD 显示出高光学对比度（Δ T  = 42.5% at 630 nm），P(BCPO- co -ProD)/PEDOT ECD 显示出高着色效率（η = 454.1 cm ² •C ^-1在 630 nm)。此外，P(BCPO- co-ProD 衍生物）/PEDOT ECD 具有足够的光学记忆和长期氧化还原循环稳定性。

背景：当增加电位或掺杂化学物质时，聚咔唑可以产生相当稳定的自由基阳离子（极化子）和双极化子（双极化子）。此外，咔唑和苯基氧化膦分别是 BCPO 中的供体 (D) 和受体 (A) 单元。在聚咔唑中加入苯基氧化膦可改善电荷平衡和载体迁移率。研究五种含苯基氧化膦的聚咔唑及其相应 ECD 在经历氧化还原过程后的吸收光谱和多色电致变色是很有趣的。

方法：一系列含苯基氧化膦的阳极聚合物（PBCPO、P(BCPO - co -ProD-Me ₂ )、P( BCPO- co -ProD-Et ₂ )、P( BCPO- co -ProD-Bz ₂ )、和 P(BCPO- co- ProD)) 电沉积在 ITO 涂层玻璃上。PBCPO/PEDOT, P(BCPO- co -ProD-Me ₂ )/PEDOT, P(BCPO- co -ProD-Et ₂ )/PEDOT, P的吸收光谱、颜色变化、响应时间和长期电化学稳定性(BCPO - co -ProD-Bz ₂ )/PEDOT 和 P(BCPO- co- ProD)/PEDOT ECD 进行了全面的研究。

重要发现：所制备的含苯基氧化膦的聚咔唑表现出多色电致变色和高透光率变化（Δ T  = 55% 在 740 nm），这为开发新一代电致变色电极提供了新的结构见解。