Upconversion luminescence mechanisms of Er(3+) ions under excitation of an 800 nm laser.
Upconversion luminescence mechanisms of Er(3+) ions under excitation of an 800 nm laser.
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DOI：
10.1039/c5cp00057b
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发表时间：
2015-04
期刊：
影响因子：
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通讯作者：
Xiaoying Shang;Pin Chen;T. Jia;D. Feng;Shian Zhang;Zhenrong Sun;J. Qiu
中科院分区：
文献类型：
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作者：
Xiaoying Shang;Pin Chen;T. Jia;D. Feng;Shian Zhang;Zhenrong Sun;J. Qiu
三价镧系离子的上转换（UC）发射的基本过程对于设计和提高UC材料的性能至关重要。然而，由于UC机制具有丰富的能态，因此在一个系统中涉及多个过程，这给独占验证和定量评价主导过程带来了挑战。本文研究了Er（3+）掺杂的nayf4玻璃陶瓷在800 nm连续波激光激发下的绿色和红色发射机理，包括激发功率依赖性、偏振依赖性和瞬态演化。在800 nm和1500 nm飞秒激光器的泵浦探测系统中，比较了单/双波长激发下的UC发射特性。结果表明，(4)I15/2→(4)I9/2→(4)I13/2→(2)H11/2/(4)S3/2的激发态吸收途径在绿带发射中起主导作用，(4)I11/2 + (4)I13/2→(4)F9/2 + (4)I15/2的交叉弛豫途径在红带发射中起主要作用。
The fundamental processes of upconversion (UC) emissions from trivalent lanthanide ions are essential for designing and improving the performance of UC materials. However, UC mechanisms involve multiple processes in one system because of the abundant energy states, which make it a challenge to exclusively verify and quantitatively evaluate the dominant process. In this paper, the mechanisms of green and red emissions in Er(3+) doped NaYF4-glass ceramics under 800 nm continuous wave laser excitation are studied via excitation power-dependence, polarization-dependence, and the transient evolution. These UC emission properties are compared with those under single-/two-wavelength excitation in a pump-probe system of 800 nm and 1500 nm femtosecond lasers. These results indicate that the excited state absorption pathway of (4)I15/2 → (4)I9/2 → (4)I13/2 → (2)H11/2/(4)S3/2 plays the dominant role in the emission of the green band, and the cross relaxation pathway of (4)I11/2 + (4)I13/2 → (4)F9/2 + (4)I15/2 plays the main role in the emission of the red band.