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Ball-milling 1

Lamp phosphor waste 1

Mechanochemistry 1

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afterglow photoluminesent materials 1

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Current Situation and Trend of the Phosphors for Full Spectrum LED Lighting

Chen Xiaoxia, Zhang Xia, Liu Ronghui, Liu Yuanhong, Zhou Yipeng, Zhuang Weidong

Strategic Study of CAE 2020, Volume 22, Issue 2, Pages 71-78 doi: 10.15302/J-SSCAE-2020.02.011

Abstract: In this paper, the key materials for full spectrum LED phosphors are discussed and compared in detailThe advantages and disadvantages, research progress, and practical application of various color phosphorsCurrently, there remain many problems in the phosphors excited by violet and near ultraviolet light,For example, the blue and cyan phosphors take on narrow emission spectrum, low light efficiency, andpoor thermal stability; yellow phosphors and far-red phosphors have a low luminous efficiency due to

Keywords： full spectrum LED high-quality lighting violet LED chip phosphors

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Development of the Long Afterglow Phosphors and Its Production

Xiao Zhiguo,Tang Mingdao

Strategic Study of CAE 2003, Volume 5, Issue 9, Pages 82-86

Abstract:

The development of long afterglow phosphors is discussed in this paper.Property and application of the phosphors are introduced in detail.It is sure that new long afterglow phosphors is excellent compared with traditional phosphors ZnS.Prospects of long afterglow phosphors is studied in the same time.

Keywords： auto-photoluminesent pigment afterglow photoluminesent materials RE elements

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Mechanochemical-Assisted Leaching of Lamp Phosphors: A Green Engineering Approach for Rare-Earth Recovery Article

Steff Van Loy, Koen Binnemans, Tom Van Gerven

Engineering 2018, Volume 4, Issue 3, Pages 398-405 doi: 10.1016/j.eng.2018.05.015

Abstract:

Rare-earth elements (REEs) are essential metals for the design and development of sustainable energy applications. Recycling these elements from waste streams enriched in them is crucial for securing an independent future supply for sustainable applications. This study compares the mechanisms of mechanical activation prior to a hydrometallurgical acid-leaching process and a solvometallurgical mechanochemical leaching process for the recovery of REEs from green lamp phosphor, LaPO4:Ce³⁺, Tb³⁺. After 60 min of processing time, the REE leaching rates showed a significant enhancement of 60% after cycled mechanical activation, and 98% after the combined mechanochemical leaching process. High-resolution transmission electron microscopy (HR-TEM) imaging disclosed the cause for the improved REE leaching rates: The improved leaching and leaching patterns could be attributed to changes in the crystal morphology from monocrystalline to polycrystalline. Reduction of the crystallite size to the nanoscale in a polycrystalline material creates irregular packing of chemical units, resulting in an increase in defect-rich grain boundaries in the crystals, which enhances the leaching process. A solvometallurgical method was developed to combine the mechanical activation and leaching process into a single step, which is beneficial for operational cost. This results in an efficient and simple process that provides an alternative and greener recycling route for lamp phosphor waste.

Keywords： Mechanochemistry Rare-earth elements Lamp phosphor waste Ball-milling Solvometallurgy