Abstract
We summarize the strategies for improving the waterproofness of Mn4+-doped fluoride phosphors, including organic coating, inorganic heterogeneous/homogeneous coating, surface deactivation, preparation of single crystal phosphor, and other methods.
Highlights
Over the last decade, white light-emitting diodes (LEDs) have found their way into many critical applications from general lighting to backlights for liquid crystal displays
This review summarizes six strategies that have been employed to improve the waterproofness of Mn4+-doped fluoride phosphors, including organic coating, inorganic heterogeneous/homogeneous coatings, surface deactivation, preparation of single crystal phosphors, and other methods
We reviewed in this paper the six classes of strategies for improving the waterproofness of fluoride phosphors, including organic coating, inorganic heterogeneous/homogeneous coating, surface deactivation, preparation of single crystal phosphors, and other methods
Summary
Multiple peaks), are the two main classes of red-emitting phosphors used in blue LED pumped white lighting. Qu is a master student at Zhengzhou University, China Her current research focuses on Mn4+-activated oxyfluoride redemitting phosphors. Deterioration occurs due to water attack which causes the color change and lumen loss over time This process gets accelerated when the phosphor is stressed by heat with temperatures up to B200 1C in high brightness LEDs. Deterioration of Mn4+-doped fluoride phosphors due to water attack lies in the hydrolysis of the [MnF6]2À group contained in the fluoride phosphors, especially those at the surface of the particles. The water molecule could take the place of fluorine forming KMnF4ÁH2O This darkens the phosphor and severely weakens the intensity of red luminescence. Dr Haipeng Ji is an associate professor at School of Materials Science and Engineering, Zhengzhou University, China He received his BSc and PhD degrees from the China University of Geosciences (Beijing). We classify the case reported strategies to prevent the deterioration of fluoride phosphors into six classes, i.e., organic coating, inorganic heterogeneous/homogeneous coating, surface deactivation, preparation of single crystal phosphors, and others
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