Long afterglow in hexagonal SrAl₂O₄:Eu²⁺, Dy³⁺ synthesized by crystallization of glass and solidification of supercooled melts

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• 作者：Kenji Shinozaki^a ; ^b ; ^{k-shinozaki@aist.go.jp" class="auth_mail" title="E-mail the corresponding author} ; Tsuyoshi Honma^a ; Mario Affatigato^c ; Takayuki Komatsu^a
• 关键词：Afterglow ; Crystallization of glass ; Solidification of supercooled melt ; Levitation melting ; High temperature phase
• 刊名：Journal of Luminescence
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：177
• 期：Complete
• 页码：286-289
• 全文大小：559 K

文摘

High temperature phase of hexagonal SrAl₂O₄:Eu²⁺,Dy³⁺ crystals were synthesized via two paths; (1) heat-treatment on glass (a conventional glass crystallization technique), and (2) solidification of supercooled melts in melt-cooling process with non-contact process, where a levitation melting technique was used to obtain precursor glass and ceramics beads. Hexagonal SrAl₂O₄ (βʹ-phase) were formed in both samples, not stable phase of monoclinic phase (α-phase), which is well known as one of the best afterglow material. Both samples with hexagonal phase showed brighter broad green emission, higher intensity of PLE peak in visible region (λ=400–500 nm), and longer duration of afterglow compared to monoclinic SrAl₂O₄:Eu²⁺,Dy³⁺ sintered by solid-state reaction.