Eu2O3和Nd2O3共掺杂SrAl2O4单晶的长余辉机理,CrystEngComm

当前位置： X-MOL 学术 › CrystEngComm › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Eu2O3和Nd2O3共掺杂SrAl2O4单晶的长余辉机理
CrystEngComm ( IF 2.6 ) Pub Date : 2024-01-09 , DOI: 10.1039/d3ce01006f
Qunyue Zhang ₁ , Yuchen Lu ₁ , Bernard A. Goodman ₁ , Jingwen Hou ₁ , Shanshan Ye ₁ , Bin Huang ₁ , Shoulei Xu _{1,

2} , Wen Deng _{1,

2} , Dingkang Xiong _{1,

2}

Affiliation

据报道，一系列共掺杂 1.0 mol% Eu ₂ O ₃和 (0.5–3.0 mol%) Nd ₂ O _{3的 SrAl}₂ O ₄单晶具有持久发光。晶体在Ar气氛下在光学浮区炉中成功生长，并且由具有单斜结构的单相组成。所有样品的光激发光谱 (PLE) 的最大强度峰值位于 421 nm。在 421 nm 激发下，光致发光 (PL) 光谱显示出以 522 nm 为中心的可见光区域的宽发射，对应于 Eu 2+ ^4f 6 ^5d 1 ^→ 4f ⁷跃迁，以及近红外区域的三个附加发射，对应于⁴ F _3/2 → ⁴ I _9/2 (880/907 nm)、⁴ F _3/2 → ⁴ I _11/2 (1062/1114 nm) 和⁴ F _3/2 → ⁴ I _{13/ 2} (1332 nm) 从 Nd ³⁺跃迁。热释光（TL）光谱显示，导带中的陷阱比单掺杂Eu样品的陷阱浅，并且随着Nd ^{3+含量的增加，陷阱的浓度逐渐增加，在2.5 mol% Nd}₂ O制备的晶体中达到最大值。₃ .余辉衰减曲线的寿命也随着晶体中Nd ^{3+含量的增加而增加，在2.5 mol% Nd}₂ O ₃时达到近35秒的最大值。提出了长余辉的机制，其中Eu ²⁺电子首先被激发，然后通过导带传输到作为陷阱的缺陷中心（由Nd ³⁺掺杂产生），并且室温下的热能足以逆转这个过程，从而建立平衡并产生长剩余发光。

"点击查看英文标题和摘要"

Mechanism for the long afterglow in Eu2O3 and Nd2O3 co-doped SrAl2O4 single crystals

Persistent luminescence is reported for a series of SrAl₂O₄ single crystals co-doped with 1.0 mol% Eu₂O₃ and (0.5–3.0 mol%) Nd₂O₃. Crystals were successfully grown under an Ar atmosphere in an optical floating zone furnace and consisted of a single phase with a monoclinic structure. The maximum intensity of the photoexcitation spectra (PLE) of all samples peaked at 421 nm. Under excitation at 421 nm, the photoluminescence (PL) spectra showed a broad emission in the visible region centered on 522 nm, which corresponds to the Eu²⁺ 4f⁶5d¹ → 4f⁷ transition, and three additional emissions in the near infrared region, corresponding to the ⁴F_3/2 → ⁴I_9/2 (880/907 nm), ⁴F_3/2 → ⁴I_11/2 (1062/1114 nm) and ⁴F_3/2 → ⁴I_13/2 (1332 nm) transitions from Nd³⁺. Thermoluminescence (TL) spectra showed that traps in the conduction band are shallower than that of the singly Eu-doped sample, and their concentration gradually increased with increasing Nd³⁺ content, reaching a maximum in the crystal prepared with 2.5 mol% Nd₂O₃. The lifetime of the afterglow decay curve also increased with increasing Nd³⁺ content of the crystals, reaching a maximum value of almost 35 seconds with 2.5 mol% Nd₂O₃. A mechanism for the long afterglow is proposed in which Eu²⁺ electrons are first excited, then transported through the conduction band to defect centers which function as traps (produced by Nd³⁺ doping), and the thermal energy at room temperature is sufficient to reverse this process, so that equilibrium is established and a long residual luminescence results.

更新日期：2024-01-09

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南