In consideration of the advantages of light-emitting electrochemical cells (LECs), it is desired to develop the saturated blue LECs for LEC display, which is hindered by the features of broad emission spectrum and emission peak not short enough. In this study, we demonstrated a novel method to improve blue saturation of the sky-blue LECs by engineering its emission spectrum through the plasmonic filters. These plasmonic filters composed of randomly distributed silver nanoparticles (Ag-NPs) can absorb the green and red emission tail of the sky-blue LECs due to localized surface plasmon resonance (LSPR). The LSPR wavelengths of Ag-NPs are tuned by manipulating the effective refractive index of materials around Ag-NPs through the accurate control of the TiO₂ thickness using atomic layer deposition technique. By integrating with the plasmonic filters, the CIE1931 coordinate of the blue LECs can approach to (0.14, 0.22), which is comparable to or even better than the reported bluest values of blue LECs. Combination with the green and red LECs, the color gamut increases from 34% (without filters) to 54% of National Television System Committee (NTSC) color gamut, corresponding to 1.6 times enhancement. In addition, the blue LECs integrated with plasmonic filters still have better efficiency than those of the reported bluest LECs.

考虑到发光电化学电池（LEC）的优点，期望开发用于LEC显示的饱和蓝色LEC，其由于宽的发射光谱和发射峰不够短的特征而受到阻碍。在这项研究中，我们展示了一种新的方法，可通过设计通过等离激元滤波器的发射光谱来改善天蓝色LEC的蓝色饱和度。这些由局部分布的银纳米粒子（Ag-NPs）组成的等离子滤波器可吸收由于局部表面等离振子共振（LSPR）而产生的天蓝色LEC的绿色和红色发射尾巴。通过精确控制TiO _2来控制Ag-NPs周围材料的有效折射率，从而调节Ag-NPs的LSPR波长。厚度采用原子层沉积技术。通过与等离激元滤波器集成，蓝色LEC的CIE1931坐标可以接近（0.14，0.22），与报告的蓝色LEC的最蓝值相当甚至更好。结合绿色和红色LEC，色域从国家电视系统委员会（NTSC）色域的34％（不带滤镜）增加到54％，相当于增强了1.6倍。此外，与等离子滤波器集成的蓝色LEC仍然比已报道的最蓝色的LEC具有更好的效率。