Article
Materials Science, Ceramics
M. Rakshita, Aachal A. Sharma, Payal P. Pradhan, K. A. K. Durga Prasad, K. Jayanthi, D. Haranath
Summary: A self-activated Zn3V2O8 phosphor-based white light emitting device (WLED) with desired CCT and CRI values was successfully fabricated. The Zn3V2O8 phosphor showed high visible yellow emission and significant quantum efficiency. Combining with blue LED resulted in high-quality white light emission. This work demonstrates the potential of Zn3V2O8 as a candidate for high-quality phosphor-converted WLEDs.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Sunggeun Shim, Woon Bae Park, Minseuk Kim, Jin-Woong Lee, Satendra Pal Singh, Kee-Sun Sohn
Summary: The novel KGaS2 phosphor host fills the cyan gap in phosphor-converted white light-emitting diodes (pc-wLEDs) with optimized composition and excellent photoluminescence properties. It performs much better under near-UV excitation compared to blue excitation, making it suitable for pc-wLED applications.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Analytical
Jiadong Yu, Shudong Yu, Ting Fu, Yong Tang
Summary: The use of micro-prism patterned remote phosphor films enhances both luminous efficiency and color uniformity of rpc-LEDs. Experimental results show significant improvements in luminous flux and color stability with the double prism-patterned RP film configuration compared to traditional RP layers.
Article
Materials Science, Ceramics
Harpreet Kaur, Mula Jayasimhadri
Summary: Pr3+-doped calcium bismuth vanadate phosphors were successfully synthesized using a citrate-gel method, showing intense red emission bands and concentration quenching at higher Pr3+ ion concentrations. The phosphors exhibited CIE coordinates in the red region and demonstrated significant thermal stability in temperature-dependent spectral studies.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Nanoscience & Nanotechnology
Shihai Miao, Yanjie Liang, Ruiqi Shi, Weili Wang, Yongfu Li, Xiao-Jun Wang
Summary: This study presents a blue light-emitting diode (LED)-pumped short-wave infrared (SWIR) phosphor with efficient broadband SWIR luminescence. It incorporates Cr3+ and Ni2+ ions into the MgGa2O4 lattice and exhibits intense SWIR luminescence under blue light excitation. The optimized SWIR phosphor shows a high photoluminescence quantum efficiency and outstanding thermal stability. A SWIR light source is successfully fabricated using this phosphor, demonstrating the feasibility and importance of SWIR technology.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Haotian Ma, Li Guan, Tao Yin, Yue Wu, Zhenyang Liu, Dawei Wang, Fenghe Wang, Nian Fu, Xu Li
Summary: This study successfully synthesized a series of Sr3Al2O5Cl2:x%Bi3+ phosphors and explained their fluorescence behavior through a two-site-occupying emission mechanism. The study also found that the Sr1 site generated 490nm emission light and the Sr3 site generated 556nm emission light.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
Wenqing Niu, Zengyi Xu, Weihuang Xiao, Yu Liu, Fangchen Hu, Guangxu Wang, Jianli Zhang, Zhixue He, Shaohua Yu, Jianyang Shi, Nan Chi
Summary: This paper introduces a VLC system based on LEDs, which can provide both illumination and wireless communication simultaneously. By utilizing specific LEDs and a precoding scheme, the experimental results show that the system has good interference cancellation performance and high data transmission rate.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Youkui Zheng, Hong Li, Tongsheng Yang, Junpeng Li, Shuqing Yang, Jing Zhu
Summary: A single-phase white-emitting phosphor Bi4BPO10 (BBP):Dy3+ was synthesized via a solid-state reaction route, and it exhibits satisfactory thermostability and potential for application in solid-state white lighting sources.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Jinpeng Xie, Bonan Liu, Qingtao Qong, Zhicheng Xu, Zhiqiang Jin, Wangjing Ma
Summary: By co-doping Eu3+, Eu2+ and Tb3+ ions into a single phase Gd2O2S, a tricolor (RGB) emission band can be obtained, resulting in white light emission, with an optimum ion doping level of 10% Eu and 0.7% Tb effectively emitting nearly pure white color photoluminescence.
Article
Optics
Xi Zhang, Song Qing, Yi Qin, Qiang Zhou, Jing Wan, Huaijun Tang, Zhenglian Wang
Summary: Searching for efficient Mn4+ red phosphors for white lighting and display backlighting has attracted great attention. In this work, an efficient Mn4+-doped fluoroscandate, Rb2KScF6:Mn4+, with short fluorescence lifetime was prepared using a simple co-precipitation method. The nonequivalent occupation of Mn4+ for Sc3+ led to sharp red emissions, enhanced zero-phonon line, high quantum efficiency, and short fluorescence lifetime under blue light excitation. By coating the red Rb2KScF6:Mn4+ phosphor with yellow Y3Al5O12:Ce3+ or green beta-SiAlON:Eu2+ phosphor in various white light-emitting diodes, good optical parameters such as high color rendering index, low correlated color temperature, and acceptable color gamut were achieved, demonstrating its potential for white light illumination and backlight display applications.
JOURNAL OF LUMINESCENCE
(2023)
Article
Physics, Applied
Ziqian Qi, Linning Wang, Yingze Liang, Pengzhan Liu, Hongbo Zhu, Yongjin Wang
Summary: This article introduces a solar-blind full-duplex light communication system using 275-nm DUV LEDs, which eliminates electromagnetic interference and solar noise. The system allows a maximum communication distance of 7 meters and supports real-time video and file sharing.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Joonseo Park, Jin-Woong Lee, Satendra Pal Singh, Minseuk Kim, Byung Do Lee, Woon Bae Park, Kee -Sun Sohn
Summary: A novel quaternary sulfide phosphor emitting cyan light was discovered and found to be suitable for LED applications due to its high photoluminescence intensity and optimal crystallinity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
G. Kalyon, S. Mutlu, F. Kuruoglu, I. Pertikel, I. Demir, A. Erol
Summary: We report an n-type In0.53Ga0.47As based Gunn light emitting diode operated at around 1.6 mu m. The device structure comprises of an n-type In0.53Ga0.47As epilayer with a thickness of 5 mu m grown by Metal Organic Vapour Phase Epitaxy (MOVPE) on a semi-insulating InP substrate and fabricated in a planar architecture with a stepped structure at anode side to suppress the destructive effect of high built-in electric field in propagating Gunn domain. Gunn diode is operated under pulsed voltage with a pulse width of 60 ns and pulse duration of 4.5 ns to keep the duty cycle as low as 0.0013%. The Gunn oscillations with an 1 ns period are observed at around 4.1 kV/ cm, which corresponds to the electric field threshold of Negative Differential Resistance (NDR). The light emission at around 1.6 mu m also starts at the threshold electric field of the NDR region (E = 4.2 kV/cm) of the current-voltage curve, and the emission intensity increases drastically with increasing applied electric field. The observed light emission at NDR threshold electric field where Gunn oscillations appear on the voltage pulse is attributed to the impact ionisation process occurring in the current domains along the sample, which generates excess carriers to initiate the band-to-band recombination in In0.53Ga0.47As.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Spectroscopy
P. Vinodkumar, Sitakanta Panda, G. Jaiganesh, R. K. Padhi, U. Madhusoodanan, B. S. Panigrahi
Summary: A single-component white-light emitting phosphor SrBPO5: Ce3+, Dy3+ was prepared with high color purity and thermal stability through high temperature solid state reaction. The presence of Ce3+ along with Dy3+ resulted in efficient energy transfer and enhancement of Dy3+ luminescence towards white light emission. Energy transfer and thermal stability were confirmed through various studies including temperature-dependent photoluminescence and SEM imaging.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Chemistry, Analytical
T. S. Sreena, P. Prabhakar Rao, T. R. Aju Thara, Athira K. Raj
Summary: A new lanthanide-free self-activated full-color emission phosphor was developed for use in pc-white light emitting diodes. Y doping in the Sr3Bi(VO4)3 structure allows tuning of the emission spectrum, with a peak wavelength around 535nm and a large full width half maximum.