Re-processing CRT phosphors for mercury-free applications

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• 作者：Jeannette Dexpert-Ghys ; Sophie Regnier ; Sophie Canac ; Tristan Beaudette ; Philippe Guillot ; Bruno Caillier ; Robert Mauricot ; Julien Navarro ; Salem Sekhri
• 关键词：Phosphors ; Rare-earth phosphors ; CRT ; Plasma ; Wastes ; Reclaiming
• 刊名：Journal of Luminescence
• 出版年：2009
• 出版时间：December 2009
• 年：2009
• 卷：129
• 期：12
• 页码：1968-1972
• 全文大小：371 K

文摘

This study is part of an operation in the framework of treatment and revalorization of IEEE (Informatics, Electronics and related) wastes. It aims to recover the active phosphors in cathode ray tubes (CRTs) and to re-cycle these powders by appropriate treatments as phosphors for mercury-free applications such as plasma display panels, flat lamps, advertising and lighting. The studied waste comes from a large panel of CRTs from any supplier. Several thermo-chemical treatments have been investigated. The removal of zinc sulfide-based phosphors and the recovery of a red phosphor Y₂O₃:Eu³⁺ has been achieved by one (basic attack) route. The photoluminescence efficiency under VUV excitation of the obtained powders is at most 30 % that of a commercial phosphor. The second route (acid attack) appears less promising. It has been established that silicate-based impurities could prevent isolating the yttrium based phosphor.