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Efficient Ce3+ → Tb3+ energy transfer pairs with thermal stability and internal quantum efficiency close to unity
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2022-11-01 , DOI: 10.1039/d2qi01967a
Quwei Ni 1, 2 , Jiansheng Huo 2 , Jiachun Liu 1 , Haojun Yan 1 , Qijian Zhu 1 , Jieying Li 1 , Chenggang Long 3 , Qianming Wang 1
Affiliation  

The exploitation of functional phosphors possessing a variety of advantages, including narrow-band emission, fast response to near-ultraviolet (n-UV)/blue light excitation, high quantum efficiency, and low thermal quenching, is essentially important for the wide-color-gamut display backlights. It is the first example to introduce Ce3+–Tb3+ pairs into the Ca3Lu2Si6O18 (CLSO) host for identifying a novel green-emitting material with all the mentioned properties. The efficient Ce3+ → Tb3+ energy transfer process was monitored in the CLSO host via dipole-quadruple interactions between Ce3+ and Tb3+ ions, leading to a wide excitation band in the n-UV region and bright green light with a main sharp emission band at 543 nm. Moreover, the composition-optimized sample has been found to achieve extremely high internal quantum efficiency (close to unity) and excellent thermal stability (lost only 13.2% of the initial emission intensity at 150 °C), which are more favorable than those shown by a vast majority of green-emitting phosphors reported recently. The prototype pc-WLED fabricated using the as-prepared sample as the green component exhibited a high luminous efficiency (LE) of 31.48 lm W−1 and a wide color gamut of 91.2% (area ratio) National Television Standards Committee (NTSC) 1953 standard. These attractive properties verified that the proof of concept concerning the designed sample will be a promising candidate to substitute the current green color phosphors for wide-color-gamut display backlights.

中文翻译:

高效的 Ce3+ → Tb3+ 能量转移对,热稳定性和内量子效率接近统一

开发具有多种优势的功能性荧光粉,包括窄带发射、对近紫外 (n-UV)/蓝光激发的快速响应、高量子效率和低热猝灭,对于宽色域来说至关重要。 -色域显示背光。这是第一个将 Ce 3+ -Tb 3+对引入 Ca 3 Lu 2 Si 6 O 18 (CLSO) 主体以识别具有所有上述特性的新型绿色发光材料的示例。通过Ce 3+之间的偶极-四重相互作用在CLSO 主体中监测有效的 Ce 3+ → Tb 3+能量转移过程和 Tb 3+离子,导致 n-UV 区域的宽激发带和明亮的绿光,在 543 nm 处具有主要的尖锐发射带。此外,已发现成分优化的样品实现了极高的内量子效率(接近于 1)和出色的热稳定性(在 150°C 下仅损失初始发射强度的 13.2%),这比最近报道了绝大多数绿色荧光粉。使用所制备的样品作为绿色组件制造的原型 pc-WLED 表现出 31.48 lm W -1的高发光效率 (LE)以及 91.2%(面积比)的广色域国家电视标准委员会 (NTSC) 1953 标准。这些吸引人的特性验证了有关设计样品的概念验证将是替代当前绿色荧光粉用于广色域显示背光的有希望的候选者。
更新日期:2022-11-01
冰冰发布于2022-11-02  2
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