High color purity aluminate phosphor SryCa1-x-yAl12O19: xEu2+ for lighting and backlight display applications

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2024-10-13 DOI:10.1016/j.jlumin.2024.120941

Zhaofeng Tian, Yangai Liu, Ci'an Xie, Juyu Yang, Yukun Liu, Chenguang Yang, Ruiyu Mi, Lefu Mei

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引用次数: 0

Abstract

In the context of the rapid advances in electronic information technology, the advancement of novel high-efficiency narrow-band blue phosphors represents a pivotal step in the advancement of high-quality liquid crystal displays (LCDs), as well as the development of white light-emitting diodes (WLEDs) with a reduced correlated color temperature (CCT). In this study, based on the sensitivity of Eu²⁺ emission to local environment, the alkaline earth aluminate material CaAl₁₂O₁₉ with high structural symmetry was selected as the matrix, and the symmetry of crystal structure was improved by replacing Ca²⁺ with Sr²⁺, the narrow-band emission of the phosphor is realized. The Sr_0.9Ca_0.09Al₁₂O₁₉: 0.01Eu²⁺ (SCAO: Eu²⁺) phosphor exhibited narrow-band emission with the full width at half maximum (FWHM) of 45.76 nm, and the colour purity of up to 95.46 %. Moreover, the internal quantum efficiency (IQE) of SCAO: Eu²⁺ has been demonstrated to reach 81.70 %. In addition, SCAO: Eu²⁺ phosphor, (Ba, Sr)₂SiO₄: Eu²⁺ phosphor, CaAlSiN₃: Eu²⁺ phosphor, and 275 nm UVLED chips were combined to prepare white LED devices exhibiting a low color temperature (3733 K). The three-band LEDs of SCAO: Eu²⁺, β-Sialon: Eu²⁺ and K₂SiF₆: Mn⁴⁺ exhibited a colour gamut covering 84.75 % of the National Television Standards Committee (NTSC) standard. This indicates that the phosphor possesses the characteristics of a highly effective narrow-band blue-light-emitting substance with considerable potential for utilization in lighting and backlighting displays.

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用于照明和背光显示应用的高色纯铝酸盐荧光粉 SryCa1-x-yAl12O19: xEu2+

在电子信息技术突飞猛进的背景下，新型高效窄带蓝色荧光粉的发展是推动高质量液晶显示器（LCD）以及相关色温（CCT）更低的白光发光二极管（WLED）发展的关键一步。本研究基于 Eu2+ 发射对局部环境的敏感性，选择了结构对称性较高的碱土铝酸盐材料 CaAl12O19 作为基体，并通过用 Sr2+ 替代 Ca2+ 提高了晶体结构的对称性，实现了荧光粉的窄带发射。Sr0.9Ca0.09Al12O19: 0.01Eu2+ (SCAO: Eu2+)荧光粉的窄带发射半最大全宽（FWHM）为 45.76 nm，色纯度高达 95.46 %。此外，SCAO：Eu2+ 的内部量子效率（IQE）已被证实达到 81.70%。此外，将 SCAO: Eu2+ 荧光粉、(Ba, Sr)2SiO4: Eu2+ 荧光粉、CaAlSiN3: Eu2+ 荧光粉和 275 纳米 UVLED 芯片结合起来，制备出了具有低色温（3733 K）的白光 LED 器件。由 SCAO: Eu2+、β-Sialon：Eu2+、β-Sialon：Eu2+ 和 K2SiF6：Mn4+ 的三波段 LED 显示出的色域覆盖了美国国家电视标准委员会 (NTSC) 标准的 84.75%。这表明该荧光粉具有高效窄带蓝光发光物质的特性，在照明和背光显示器中具有相当大的应用潜力。

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.