Synergistic effect of crystal structure and concentration quenching on photoluminescence of Er³⁺ doped upconversion nanocrystals

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• 作者：Canying CAI (蔡灿英)^a ; ^b ; ^{cycai@xtu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yanlin JIN (靳彦林)^a ; ^b ; Qibin YANG (杨奇斌)^a ; ^b ; Xiaoshu NIE (聂晓书)^a ; ^b ; Yunxin LIU (刘云新)^c ; ^{lyunxin@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：upconversion ; luminescence ; nanocrystal ; crystal structure ; concentration quenching ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：34
• 期：10
• 页码：963-971
• 全文大小：1948 K

文摘

YbF_2.357, YbF₃, Ba₂YbF₇, and BaF₂ upconversion nanocrystals doped with emitter Er³⁺ ion were synthesized in the same solvent system just with changing the molar ratio of Ba²⁺ to Yb³⁺ in the precursor, which corresponed to the crystal phases of rhombohedral, orthorhombic, tetragonal, and cubic, respectively. All the samples emitted both 660 nm red light and 543/523 nm green light which originated from Er³⁺-4fⁿ electronic transitions ⁴F_9/2-⁴I_15/2 and ⁴S_3/2/²H_11/2-⁴I_15/2, respectively. It was worth mentioning that YbF₃:Er³⁺, Ba₂YbF₇:Er³⁺, and BaF₂:Er³⁺ could emit dazzlingly bright light even under the excitation of a 980 nm CW laser with output power of 0.1 W. Upconversion emission mechanism analysis indicated that the intensity ratio of red to green light highly depended on the synergistic effect of crystal structure, concentration quenching, and particle size, but were not sensitive to crystallinity as previously reported for NaLnF₄ (Ln=lanthanide).