Source abstract
Abstract
Searching for new green phosphors featured with a narrow band, small Stokes-shift, high thermal stability, and decent chemical resistance is critical for white light emitting diodes (LEDs) in liquid-crystal displays (LCDs). For the first time, we introduce a uranyl (UO22+) compound with inherently bright green emission as the activator for fabricating high-performance phosphor-converted LEDs. UO22+ was successfully incorporated into a dense, rigid, UV-transparent, and photoluminescent borate framework (Na[(UO2)B6O10(OH)]·2H2O (NaUBO-4)) exhibiting surprisingly high internal and external quantum efficiencies (close to 100% and 92% for excitation at 260 nm, respectively), low thermal quenching (96% of the initial emission intensity can be maintained at 120 °C), and high luminous stability after long-term exposure to moisture and UV radiation. Furthermore, the vibronically coupled emission from UO22+ with relatively narrow emission bands leading to a wide color range of 95% of the National Television System Committee (NTSC) standard for a white LED device, fabricated by a InGaN blue chip, green-emitting NaUBO-4, and a commercially available red-emitting phosphor KSM:Mn4+. These results make depleted uranium extremely attractive for potential applications as backlight units in wide-color-gamut LCDs.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · Radioactive element chemistry and processing · Luminescence and Fluorescent Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Environment and Material Engineering, Yantai University, Yantai 264005, P. R. China
State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, P. R. China
State Key Laboratory of Radiation Medicine and Protection, School for Radiological and Interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, 199 Ren’ai Road, Suzhou 215123, P. R. China
Funding
National Natural Science Foundation of China
References (34)
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