1.2 μm persistent luminescence of Ho3+ in LaAlO3 and LaGaO3 perovskites†,Journal of Materials Chemistry C

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1.2 μm persistent luminescence of Ho3+ in LaAlO3 and LaGaO3 perovskites†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2018-10-01 00:00:00 , DOI: 10.1039/c8tc04393k
Jian Xu _{1,

2,

3,

4} , Daisuke Murata _{1,

2,

3,

4} , Byoungjin So _{5,

6,

7,

8} , Kazuki Asami _{1,

2,

3,

4} , Jumpei Ueda _{1,

2,

3,

4} , Jong Heo _{5,

6,

7,

8} , Setsuhisa Tanabe _{1,

2,

3,

4}

Affiliation

Persistent luminescence (PersL) in the short-wave infrared (SWIR: ∼900–1700 nm) region has attracted much attention for potential biomedical imaging and night-vision surveillance applications. Although trivalent lanthanide (Ln³⁺) ions are considered to be one of the most promising luminescent centers working for this region, the lack of suitable persistent phosphor hosts is still the bottleneck of this field. Herein, by using the persistent energy transfer from Cr³⁺ to Ho³⁺, Ho³⁺ PersL at 1.2 μm has been realized in both Ho³⁺–Cr³⁺–Sm³⁺ tri-doped LaAlO₃ (LAO:Ho–Cr–Sm) and Ho³⁺–Cr³⁺ co-doped LaGaO₃ (LGO:Ho–Cr) perovskites. The Ho³⁺ photoluminescence (PL) intensity ratio between the ⁵I₆ → ⁵I₈ transition at ∼1.2 μm and the ⁵I₇ → ⁵I₈ transition at ∼2.0 μm in LAO is lower than that in LGO due to the higher phonon energy of the LAO host, resulting in its preferred population of the ⁵I₇ excited level through multi-phonon relaxation (MPR) processes. However, the LAO:Ho–Cr–Sm phosphor still exhibits superior Cr³⁺/Ho³⁺ PersL intensity than that of LGO:Ho–Cr, and it is even comparable with that of the most widely used deep-red ZnGa₂O₄:Cr³⁺ persistent phosphor. This can be explained by the efficient electron traps of Sm³⁺ ions in LAO:Ho–Cr–Sm while this kind of sensitization by lanthanide ions seems not to work in LGO:Ho–Cr based on prediction from the vacuum referred binding energy (VRBE) diagram. These results demonstrated by the flexible ABX₃ perovskites could give a vivid example to choose suitable material hosts, electron trapping centers and energy donor–acceptor combinations toward long PersL in the SWIR region.

中文翻译：

LaAlO ₃和LaGaO ₃钙钛矿中Ho ^3+的1.2μm持续发光†

短波红外（SWIR：〜900-1700 nm）区域中的持久发光（PersL）在潜在的生物医学成像和夜视监视应用中引起了极大的关注。尽管三价镧系（Ln ³⁺）离子被认为是该区域最有希望的发光中心之一，但缺乏合适的持久性磷主体仍然是该领域的瓶颈。在本文中，通过使用选自Cr持久能量转移³⁺何³⁺，何³⁺ PersL在1.2μm的已在两个何实现³⁺ -Cr ³⁺ -Sm ³⁺三掺杂的LaAlO ₃ HO-：（LAO Cr–Sm）和Ho ³⁺ –Cr ³⁺共掺杂的LaGaO ₃（LGO：Ho-Cr）钙钛矿。LAO中的⁵ I ₆ → ⁵ I ₈跃迁和〜2.0μm处的⁵ I ₇ → ⁵ I ₈跃迁之间的Ho ³⁺光致发光（PL）强度比在LAO中比在LGO中低，这是由于较高的Ho ³⁺光致发光强度比LAO主体的声子能量，通过多声子弛豫（MPR）过程导致其首选⁵ I ₇激发能级。但是，LAO：Ho–Cr–Sm荧光粉仍显示出优异的Cr ³⁺ / Ho ³⁺PersL强度高于LGO：Ho-Cr，甚至可以与最广泛使用的深红色ZnGa ₂ O ₄：Cr ³⁺持久性荧光粉相媲美。这可以用LAO：Ho-Cr-Sm中Sm ³⁺离子的有效电子陷阱来解释，而基于镧系离子的这种敏化作用似乎是基于基于真空的结合能的预测而在LGO：Ho-Cr中不起作用的（ VRBE）图。灵活的ABX ₃钙钛矿证明了这些结果，可以为选择合适的材料主体，电子俘获中心和SWIR区域中长PersL的能量供体-受体组合提供一个生动的例子。

更新日期：2018-10-01

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