Synaptic plasticity and light-triggered properties of azo-dye-doped DNA biopolymer devicesLee, Chen-Ray; Chung, Yuan-Chun; Hung, Yu-Chueh
doi: 10.1117/12.3042685pmid: N/A
In recent years, there has been significant interest in developing biomaterial-based optoelectronics. Owing to the unique interplay between DNA and functional molecules, DNA biopolymer is broadly utilized as a versatile host material. In this study, we presented the use of an azo-dye, Disperse Red 1 (DR1), incorporated in DNA-CTMA biopolymer matrix for the implementation of light-manipulated artificial synapses. To explore the role of DR1 in device operation, we investigated the electrical properties of DR1:DNA-CTMA synaptic devices, comprising of Ag/DR1:DNA-CTMA/ITO. The device performances under consecutive voltage sweeps and a series of electrical pulses were presented. To further explore light-driven effects on DR1:DNA-CTMA devices, we characterized the electrical properties under different irradiation conditions. The photoresponsive properties of devices in correlated with the light-driven effect of DR1 molecules were discussed. Our study provides physical insights toward light-manipulated conductance and synaptic plasticity in DR1:DNA-CTMA devices, advancing the development of biomaterial-based optoelectronics for photonic neuromorphic applications.
Improvement in efficiency and stability of dye-sensitized solar cell with natural dye from the peel of passion fruitLee, You-Jhen; Zhang, Yun-Yen; Tsai, Ming-Ju; Huang, Wei-An; Liang, Pin-I
doi: 10.1117/12.3042019pmid: N/A
In recent years, dye-sensitized solar cells (DSSC) have attracted lots of attention due to their low production cost, simple fabrication, and reasonably high efficiency. Organic dyes made with plants are among the most promising as they are eco-friendly, readily accessible, and low-cost in materials. This study demonstrates that when passion fruit (passiflora edulis) peels are used as dyes in DSSCs, they exhibit excellent performance in both short-circuit current and cell stability. Notably, we utilize passion fruit peel, which is a recycled waste material, thus incurring no additional material costs. Our results reveal that the DSSC with Tainung No. 1 passion fruit peel as the dye showed a significant increase in short-circuit current, with a 5-fold and 22-fold improvement compared to commonly used natural dyes (blueberries and black rice). Furthermore, we compared the fruit peels of three Taiwan-cultivated passion fruit varieties—Tainung No. 1, Full-Star, and Golden—as dye sources, and found that Tainung No. 1 had the highest open-circuit voltage, and Golden had the longest battery lifetime.
Front Matter: Volume 13363doi: 10.1117/12.3068609pmid: N/A
This PDF file contains the front matter associated with SPIE Proceedings Volume 13363, including the Title Page, Copyright information, Table of Contents, and Conference Committee information.
Effect of electron-donating and -withdrawing groups on the photophysical properties of iridium (III) diphenyl quinoxaline complexesKnorr, Erica S.; Kelly, Jordan C.; Harrison, Daniel P.; Rohrabaugh, Thomas N.
doi: 10.1117/12.3047905pmid: N/A
Ligand substitution has considerable effects on the photophysical properties of iridium(III) complexes and other transition metal cromophores which creates a need to strategically examine the influence of ligand substituents. The resulting compounds have absorption and emission profiles that span the ultraviolet (UV) and visible (Vis) regions and even stretch into the near-infrared (NIR). These materials have found use in various fields from photocatalysis and solar energy to chemical sensing and photodynamic therapy. In this work, a series of Ir(X2Me2dpqx)2(acac) complexes, where X=Me, H, F, or Cl; dpqx=diphenyl quinoxaline; acac=acetylacetone, were synthesized via microwave-assisted protocols. The developed materials were characterized via single crystal X-ray crystallography, electrochemistry, UV-Vis absorption spectroscopy, steady-state emission spectroscopy, and time-correlated single-photon counting. The incorporation of electron-withdrawing groups on the quinoxaline portion of the dpqx ligand results in stabilization of the LUMO and red-shifting of the absorption and emission profiles. However, there is classically an inverse relationship between wavelength ranges and decay times, which warrants these continual studies.
Organogold nonlinear optical chromophoresMarshall, Julia; Sutton, Gregory D.; Van Orman, Evan P.; Mihaly, Joseph J.; Wolf, Steven M.; Olumba, Morris E.; Holt, Ethan; de La Harpe, Kimberly; Grusenmeyer, Tod A.; Gray, Thomas G.
doi: 10.1117/12.3040752pmid: N/A
A series of 2,7-disubstituted organogold(I) fluorenyls and arylgold(III) complexes has been characterized by ground-state and optical techniques. In organogold(I) fluorenyls, gold(I) is bonded to the fluorenyl carbocycle via direct C–Au -bonds or alkynyl linkages, resulting in dual fluorescence and phosphorescence emission, with some cases achieving apparent white light emission. Excited-state dynamics were investigated using nanosecond and ultrafast transient absorption spectroscopy to determine rate constants for radiative and nonradiative decay as well as intersystem crossing. Emission originates from metal-perturbed ligand-centric charge-transfer (LCCT) states, with frontier orbital compositions revealing ligand-centric HOMOs and LUMOs. Arylgold(III) complexes, including Au(III)DPA and its alkynyl analogue Au(III)ADPA, were also synthesized, having fluorenyl substitution at the 2,7-positions and diphenylamine (DPA) substituents. Solutions of these complexes are transparent at wavelengths exceeding 450nm and exhibit solvent-dependent phosphorescence. Room-temperature emission spectra consist of broad, structureless emission attributed to triplet ligand-to- ligand charge transfer (3LLCT) states or structured luminescence from metal-perturbed intraligand charge transfer (3ILCT) states. DFT calculations find frontier orbitals that are primarily ligand-centered, with limited gold involvement, and triplet-state spin density is distributed across the complexes.
Efficient and stable deep-blue OLEDs for microdisplay applicationsLi, Siqi; Wu, Chengcheng; He, Wei; Tong, Kaining; Wei, Guodan
doi: 10.1117/12.3057264pmid: N/A
Organic Light-Emitting Diodes (OLEDs) have become a critical technology in the display and lighting industries, renowned for their outstanding performance features, including high contrast ratios, broad viewing angles, and rapid response times. This study demonstrates the application of a newly synthesized asymmetric iridium complex, Ir-1, as a deep-blue dopant material in OLED devices and its practical micro-display application. The iridium complex exhibits deep-blue emission at 479nm and excellent thermal stability with a decomposition temperature of 375C. Blue OLED devices based on Ir-1 achieve a maximum external quantum efficiency (EQE) of 15.6%, a maximum luminance of 2092cd/m2, and Commission Internationale de l’Éclairage coordinates of (0.16, 0.14). We successfully fabricated blue micro-OLEDs on a TFT substrate using a vacuum evaporation method, demonstrating programmable patterns at a resolution of 400PPI. These results have successfully demonstrated the potential of iridium complexes in enhancing the performance and stability of blue micro-OLEDs, thereby advancing the field of high-resolution display technologies.
Visible-light modulators and power limitators based on spin crossover material thin filmsCapo Chichi, J. Anorld; Séguy, I.; Camon, H.; Calvez, S.; Enriquez Cabrera, A.; Zhang, L.; Zhang, Y.; Salmon, L.; Molnar, G.; Ridier, K.; Bousseksou, A.
doi: 10.1117/12.3042766pmid: N/A
Phase-change materials (PCM) have emerged as promising candidates for reconfigurable photonic systems due to their ability to exhibit significant optical property changes under external stimuli. Among these, spin-crossover (SCO) molecular complexes represent an innovative class of materials with unique potential for visible-light modulation and diffraction-based applications. This study investigates the design and fabrication of SCO-based optical devices using thermally evaporated thin films of a Fe(II) triazolyl borate complex and active nanocomposites embedding SCO nanoparticles. Thin-film Fabry-Perot interferometers demonstrated modulation depths of up to 30% with narrow spectral bandwidths. Enhanced theoretical performance is predicted for double-prism Fabry-Perot interferometers, though experimental validation of this configuration remains ongoing. Building on this foundation, SCO-based nanocomposites were developed by incorporating nanoparticles into SU8 resin via spin-coating techniques. These nanocomposites enabled the fabrication of microstructured devices, including 1D diffraction gratings. Experimental tests of the diffraction gratings demonstrated active diffraction and confirmed the potential of these materials for advanced photonic applications. This work underscores the versatility of SCO molecular complexes as a platform for visible-light modulation and diffraction, advancing the integration of active nanocomposites in reconfigurable photonic devices.
High refractive index and low-birefringence specialty polymer Iupizeta EP seriesKato, Noriyuki; Shiratake, Munenori
doi: 10.1117/12.3045313pmid: N/A
Iupizeta EP, an optical-grade polymer by Mitsubishi Gas Chemical, offers precise control over optical properties like refractive index, low birefringence, and transmittance. The company has advanced the technology by repurposing scrap materials, aligning with circular economy and carbon-neutral goals. This innovation supports cutting-edge devices in smartphones, AR/VR/MR, robotics, and more. The presentation will highlight these "Chemical Innovations" and their impact on society.
Polymeric waveguide resonators in integrated photonicsChang, Yi; Cao, Jia-Hao; Lin, Jia-Huei; Liang, I-Chang; Wang, Cheng-Chi; Wang, Pei-Hsun
doi: 10.1117/12.3042611pmid: N/A
Polymer materials offer unique optical properties in photonic applications, including flexibility, patternable structures, friendly fabrication, and the ability to tailor optical properties through chemical modifications. In this work, we explore the potential of polymers for creating high-quality waveguides. The conventional polymeric waveguides and hybrid waveguides with a silicon nitride (Si3N4) layer will be investigated. Without the need of delicate lithography methods, such as electron-beam or deep-UV lithography, high-quality waveguide resonances can be realized on the glass substrate using UV contact lithography. In addition, by properly designing the coupling between waveguides, we demonstrate uniform spectra with high extinction ratios in telecommunication bands. High-quality waveguide resonators with a quality (Q) factor of up to 7104 can be achieved with an extinction ratio >9dB. These achievements establish the polymeric waveguides as promising candidates for applications in photonic integrated circuits (PICs), co-packaged optics (CPO), and hybrid integration in photonic networks. Furthermore, we introduce the design of hybrid waveguide cores by incorporating high-quality, thin film (50~100nm) silicon nitride with a surface roughness below 2nm. This etch-free configuration helps to improve the refractive index contrast, enabling tighter waveguide curvatures and reducing the chip area. These advancements in polymeric waveguides on glass highlight the potential for scalable and cost-effective photonic integration, providing a promising foundation for next-generation data centers and high-performance optical technologies.