ZHUHAI MUST SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE

Tremendous progress has been achieved in comprehending the scientific principles governing nature and translating them into practical applications. Among the areas of interest within photonic systems, bioinspired color-tuning devices originating from physical structure modulation hold significant importance. This Review provides an overview of cutting-edge advancements in bioinspired structural color-tuning photonic devices across various applications. First, we delve into the origins, design principles, and fundamental physics underlying bioinspired structural color systems by showcasing diverse living species found in nature. Subsequently, we explore various photonic nano/microscale building blocks, including one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D) structures, along with their fabrication techniques. Additionally, we present various biomimetic material systems and strategies for fabricating dynamic structural color devices. Furthermore, we discuss recent breakthroughs in biomimetic photonic systems across key application areas including sensing, interactive soft robotics, digital information encryption/decryption, dynamic displays, and energy. In summary, this Review provides a comprehensive analysis of bioinspired color-tuning photonic devices, shedding light on their intricate structure-function relationships, and aims to inspire the adoption and development of advanced color-tuning strategies. Finally, we address current challenges and offer insights into potential groundbreaking developments in the field of bioinspired optical materials.

The exceptional optoelectronic properties of metal halide perovskites, including enhanced color saturation and tunable emission wavelengths, render them highly potential candidates for fabricating perovskite light-emitting diodes (PeLEDs). However, blue PeLEDs underperform relative to their red and green counterparts due to substantial nonradiative recombination losses, particularly at the perovskite/electron transporting layer (ETL) interface. Here, we propose an effective energy management strategy aimed at boosting the efficiency of blue PeLEDs by the incorporation of a multifunctional interlayer, specifically 2,8-bis(diphenylphosphoryl)dibenzo[b,d]furan (PPF), at the perovskite/ETL interface. This approach involves the formation of robust P═O/Pb bonds between PPF and perovskite surface defects, thereby effectively mitigating trap-induced nonradiative recombination. Furthermore, the high triplet energy level of PPF inhibits triplet energy transfer from the perovskite to the ETL, leading to further reductions in energy loss. Consequently, the optimized blue PeLEDs exhibit a peak external quantum efficiency (EQE) of 15.1% (peak emission at 472 nm) with a 4-fold increased operational lifetime compared to the control PeLED. Additionally, utilizing blue PeLED units treated with PPF, we achieve a record EQE of 31.1% for hybrid perovskite/organic tandem white LEDs, which exhibit a high color rendering index of 85.

Two novel iridoid-phenylethanoid glycoside heterodimers, verbenalinoside A (1) and B (2), along with two known precursors, verbenalin (3) and verbascoside (4) were isolated from the dry aerial parts of Verbena officinalis. Verbenalinoside A (1) possesses a new 5/6/6/6 core fused by the double bond of iridoid and phenolic hydroxyl groups of the phenylethanoid unit. Verbenalinoside B (2) is a conjugate of verbenalin (3) and verbascoside (4) by an ether bond. The structures of these compounds were elucidated through the comprehensive analysis of spectroscopic data, supported by electronic circular dichroism (ECD) calculations and DP4 plus NMR calculations. Biological assay results showed that 1-4 can concentration-dependent rescue the ethanol-induced hepatotoxicity in LO2 and HepG2 cells, indicating that 1-4 should be potential hepatoprotective constituents of V. officinalis.