Corrigendum to “Enhancing the emission color sensitivity of bulk microcrystals in response to excitation power density and NIR wavelength by introducing Li+/Lu3+ for anti-counterfeiting” J. Alloys Compd. 770 (2019) 1181–1188

Highly Efficient Three‐Photon Excited Red Emission in the Yb3+‐Er3+ Upconversion System at Low Excitation Intensities for Non‐Invasive Anti‐Counterfeiting

“…[ 33–37 ] This unique characteristic enables the red‐to‐green intensity ratio to increase with higher excitation intensity, leading to LCT. [ 38,39 ] Although previous studies have observed an increase in the red‐to‐green intensity ratio in certain Yb 3+ and Er 3+ codoped phosphors, this is mainly achieved at high excitation intensities (several W cm −2 ), primarily due to inefficient three‐photon excitation of the red emission at lower excitation intensities. [ 13–18 ] Overcoming this challenge necessitates suppressing Yb 3+ concentration quenching to achieve efficient three‐photon excitation.…”

Study on the Upconversion Luminescence Mechanism of Tegtragonal LiYF4: RE with Sublattice Energy Cluster Construction and Crystal Field Manipulation

“…In this work, the UCL mechanism of sublattice energy cluster construction and crystal field manipulation were revealed that may be an inspiration for high efficient UC luminescence materials design and preparation. Keywords LiYF 4 ; rare earth; sublattice structure; crystal field manipulation; upconversion luminescence 1 引言 稀土离子具有丰富的不饱和 4f 层核外电子能级结 构, 在长波光源激发下可实现反斯托克的短波光发射 [1] , 具有发射光波长分布范围广、发射谱带宽以及发射波长 可调控等优良特性, 使得稀土上转换发光材料在防 伪 [2][3][4] 、生物检测 [5,6] 、高分辨成像 [7][8][9] 、光动力治疗 [10,11] 、 药物靶向释放 [12,13] 、能源转换 [14,15] 、光催化 [16][17][18] 、光解 水 [19][20][21] 、光电器件 [22][23][24][25] 、温度传感器 [26,27] 等领域有着广 阔的潜在应用前景 [28] , 其成为近年发光材料领域研究 的热点 [29] . 当前限制稀土上转换发光材料应用的主要 瓶颈是可控发射波长、足够强的荧光强度和满足应用要 求的荧光寿命等上转换发光性能.…”