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Strategies for Enhancement Luminance of Sub-Micrometer Phosphor: A Sub-Micrometer Narrow-Band Red Phosphor with Ultrahigh Thermal Stability
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2022-10-10 , DOI: 10.1002/lpor.202200462
Yuhan Zhou 1 , Takatoshi Seto 1 , Yuhua Wang 1
Affiliation  

Nowadays, phosphors are widely used in high quality white light emitting diodes (W-LEDs) and display technology. Micro light emitting diode (Micro-LED) has the advantages of ultrahigh resolution color saturation, while ordinary phosphors are difficult to apply due to their large particle size. As is known to all, once the phosphor particle size is reduced, its luminescence intensity will loser. This paper presents a strategy to improve the luminescence intensity of sub-micrometer narrow-band red phosphors. By increasing the doping concentration of rare-earth ions through total substitution and reducing the nonradiative transition in the cell, ultrahigh concentration doping of sub-micrometer phosphors is achieved to improve the luminescence intensity. Surprisingly, with increasing Eu3+ up to entirely substitution for Gd3+ site, both the absorption efficiency and the internal quantum efficiency of the sample increased greatly. The external quantum efficiency increased from 5.42% to 19.70%. Sub-micrometer EuAl3(BO3)4 exhibits ultrahigh thermal stability, with a luminous intensity at 225 °C that is 128% of that at room temperature, meeting the conditions of extreme high-temperature environments or high-power LEDs. In summary, this work has great potential for application in W-LED and presents a solution idea to solve the luminous intensity reduction of sub-micrometer phosphors.

中文翻译:

亚微米荧光粉亮度增强策略:一种具有超高热稳定性的亚微米窄带红色荧光粉

如今,荧光粉广泛用于高质量的白光发光二极管 (W-LED) 和显示技术。微型发光二极管(Micro-LED)具有超高分辨率色彩饱和度的优势,而普通荧光粉由于粒径大而难以应用。众所周知,一旦荧光粉粒径变小,其发光强度就会降低。本文提出了一种提高亚微米窄带红色荧光粉发光强度的策略。通过全置换增加稀土离子的掺杂浓度,减少电池中的非辐射跃迁,实现了亚微米荧光粉的超高浓度掺杂,提高了发光强度。令人惊讶的是,随着 Eu 3+的增加直至完全取代Gd 3+位点,样品的吸收效率和内量子效率均有较大提高。外量子效率从5.42%提高到19.70%。亚微米级EuAl 3 (BO 3 ) 4具有超高的热稳定性,225℃发光强度是室温发光强度的128%,满足极端高温环境或大功率LED的使用条件。综上所述,该工作在W-LED中具有巨大的应用潜力,为解决亚微米荧光粉发光强度降低问题提出了解决思路。
更新日期:2022-10-10
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