Article
Chemistry, Physical
Xiaoxue Huo, Zhijun Wang, Chunjing Tao, Nan Zhang, Dawei Wang, Jinxin Zhao, Zhiping Yang, Panlai Li
Summary: A series of Tb3+, Eu3+, Tm3+ doped Mg2Y2Al2Si2O12(MYAS) phosphors were synthesized by high temperature solid-state method. The emission spectra and energy transfer between the lanthanide ions in the materials were studied in detail.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Joanna Trojan-Piegza, Eugeniusz Zych
Summary: This paper presents the generation of white-light persistent luminescence over a few hours by the doubly-doped La2Hf2O7:Ti,Pr phosphor, with thermoluminescence showing strong activator-concentration dependence. When the activator contents exceeded 0.1mol%, the persistent luminescence intensity and duration decreased accordingly.
Article
Materials Science, Multidisciplinary
Jeremy Cathalan, Mathieu Salaun, Pierre Gaffuri, Audrey Potdevin, Francois Reveret, Alain Ibanez, Genevieve Chadeyron, Isabelle Gautier-Luneau
Summary: This study focuses on the development of aluminum borate luminescent powders with broader and warmer emission. The synthesis process and conditions are adjusted to optimize the optical features. The resulting powders exhibit a wide and intense emission band, with tunable excitation wavelengths, making them potentially valuable for optical applications.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Manasa Perikala, Asha Bhardwaj
Summary: The Covid-19 pandemic has resulted in the generation of non-degradable biohazardous plastic waste globally. This study addresses this problem by recycling plastic waste to create single system white light emitting carbon dots. The synthesized carbon dot phosphor is stable against photo degradation and can be used in the fabrication of white LEDs with good color rendering index. The phosphor is scalable and environmentally sustainable, making it suitable for next generation artificial lighting systems.
Article
Chemistry, Physical
Koushik Mondal, Ashim Pramanik, Tapashree Mondal, Sujit Sankar Panja, Rajat Sarkar, Pathik Kumbhakar
Summary: This study reports the aggregation-induced enhancement (AIE) of photo-luminescence quantum yield (PLQY) in the N,N-dimethylformamide (DMF)-stabilized Au nanocluster (AuNC) system, from 12.5% to 51%. The self-assembling of AuNCs and Förster resonance energy transfer (FRET) technique were utilized to design a white LED (WLED) with CIE coordinates of (0.35, 0.29). The performance of the WLED was further improved by optimizing the components and incorporating nitrogen-doped graphene quantum dots (NGQD).
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Huaijun Tang, Qiuhong Chen, Guoyun Meng, Shiyou Lu, Jing Qin, Kaixin Yang, Long Gao, Zhengliang Wang, Yonghui He
Summary: Developing rare-earth-free (even metal-free) luminescent materials as phosphors for LEDs is of great significance due to the scarcity, cost, and unsustainability of rare-earth elements. A graphitic-C3N4 derivative containing heptazines merged with phenyls was synthesized via thermal polymerization of melamine and quinazoline-2,4(1H,3H)-dione. The resulting product showed improved photoluminescent properties, with a change in emission color from blue to green, an increase in maximum emission wavelength, and an increase in PL quantum yield. Purification through vacuum sublimation resulted in a yellowish green emission product with high thermal stability and low thermal quenching. This product was used as a phosphor in white LEDs, which exhibited good performance with high-efficiency and quasi-green emission.
Article
Materials Science, Multidisciplinary
Carlos H. Flores-Tamez, Perla Elizondo-Martinez, Rosa M. Jimenez-Barrera, Ivana Moggio, Eduardo Arias, Maria G. Sanchez-Anguiano, Maria C. Garcia-Lopez, Rodrigo Chan-Navarro
Summary: New non-conjugated luminescent glycol-terephthalate oligomers were synthesized by a free radical reaction with aryl Schiff bases, which proved to be a superior method compared to ionizing or plasma treatments in terms of processing facility and reproducibility. The compounds were characterized by various techniques, and their thermal behavior and optical properties were investigated. The anthracenyl oligomer exhibited good linearity in a carbon dioxide sensing test, making this the first report on luminescent glycol-terephthalate oligomers for carbon dioxide sensing.
Article
Optics
Tao Hu, Lixin Ning, Yan Gao, Jianwei Qiao, Enhai Song, Zitao Chen, Yayun Zhou, Jing Wang, Maxim S. Molokeev, Xiaoxing Ke, Zhiguo Xia, Qinyuan Zhang
Summary: A new red-emitting Mg2Al4Si5O18:Eu2+ composite phosphor with high efficiency and stability was discovered, which shows potential for applications in high-power solid-state lighting.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Chemistry, Organic
Guangtan Fan, Xiang Yu, Xie Han, Zhiyong Zhao, Simin Liu
Summary: The assembly of pi-conjugated azapyrene derivatives with rigid aromatic rings as bridging units into optically tunable complexes mediated by Cucurbit[n]uril (CB[n]) is reported. Color tuning, including white-light emission, is easily achieved by introducing CB[8] into the guest aqueous solution, suggesting a feasible strategy for creating tunable white-light emission materials through CB[n]-based host-guest interactions.
Article
Chemistry, Analytical
Yanmei Xu, Yufei Dong, Chunjing Tao, Panlai Li, Zhijun Wang
Summary: A series of Mg2Y2Al2Si2O12:Dy3+,Eu3+ phosphors were prepared via a solid-state method, and it was found that white light emission could be achieved by tuning the ratio of Dy3+/Eu3+. The substitution of La3+/Lu3+ improved the structure and luminescence properties of the materials, enhancing the thermal stability, which showed potential application in the area of white LEDs.
Article
Physics, Applied
Tingxing Shi, Feng Chen, Xiyu Zhao, Jiahua Zhang, Xiao-Jun Wang, Feng Liu
Summary: Upconversion charging (UCC) is an emerging approach to charge storage phosphors that has gained increasing attention due to its fundamental and practical potential. This study investigates the UCC performance of storage phosphors using a white flashlight as the excitation light source and demonstrates the involvement of excited-state absorption and energy-transfer upconversion in the UCC process. The study also introduces a conceptual thermometry approach based on the luminescence performance of the white-light charged phosphor.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Zhong-Qiu Li, Zhong-Liang Gong, Jiang-Yang Shao, Jiannian Yao, Yu-Wu Zhong
Summary: This paper proposes a simple method for in situ preparation of circularly polarized luminescence (CPL)-active microcrystals, which achieves control of luminescence dissymmetry through hydrogen bonding interactions between molecules, allowing for tunable emission colors, ordered morphology, and high luminescence efficiency.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Rajamouli Boddula, Jairam Tagare, Kasturi Singh, Sivakumar Vaidyanathan
Summary: A new class of bipolar phenanthroimidazole-based ancillary ligands and their efficient beta-diketonate Eu-III complexes have been successfully designed, synthesized, and characterized for their applications in white LEDs and temperature sensors. The Eu complexes showed pure white or red emission, depending on the ligand-to-Eu ion energy transfer, and exhibited promising quantum yield and luminous efficiency in LED applications. Additionally, their dual emissive characteristics suggest potential applications in ratiometric temperature sensing and PL studies.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Materials Science, Multidisciplinary
Filiz Karakus Basak, Ersin Kayahan
Summary: In this study, white, blue, and cyan light emitting nanostructured composites were produced by coating aged thermally oxidized porous silicon with green synthesized carbon nanostructures. This new method provides a tremendously cheap, clean, and effortless production procedure for the redesign of instruments such as LEDs, photodetectors, and biosensors, which are extremely important for optoelectronic and biomedical applications.
Article
Chemistry, Multidisciplinary
Shuzhen Li, Yan Hao, Shuai Guo, Chunjie Ding, Yujuan Ma, Ruibin Liu, Dongpeng Yan
Summary: This study developed a molecular cocrystal route to obtain three-primary-color emissive materials by adjusting different donor-acceptor units, achieving adjustable warm and cold white-light as well as multi-color emission. The blue/green/red emitters in Bdb molecular cocrystals endow them with novel color-tunable photonic properties, such as high luminescence quantum yield and polarized anisotropy, showing potential applications in full-color displays, white-light irradiation, low-dimensional optical polarization, and micro/nanophotonics.
SCIENCE CHINA-CHEMISTRY
(2022)
