Small-sized nitride phosphors achieving mini-LED backlights with superhigh brightness and ultralong durability

[Display omitted] •This work overcomes the trade-off challenge between particle size and quantum efficiency of nitride phosphors encountered in traditional preparation methods.•The underlying mechanism is clarified to be the increased Eu2+ percentage and the unaltered chemical stiffness after the me...

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Published inMaterials today (Kidlington, England) Vol. 70; pp. 82 - 92
Main Authors Li, Shuxing, Tian, Rundong, Yan, Tianyu, Guo, Yuqin, Liu, Yunpeng, Zhou, Tian-Liang, Wang, Le, Xie, Rong-Jun
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.11.2023
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Summary:[Display omitted] •This work overcomes the trade-off challenge between particle size and quantum efficiency of nitride phosphors encountered in traditional preparation methods.•The underlying mechanism is clarified to be the increased Eu2+ percentage and the unaltered chemical stiffness after the mechanochemical processing.•Small-sized nitride phosphors with superhigh brightness and ultralong durability. High brightness mini-LED backlit displays attract extensive advanced applications. However, it is a challenge to develop small-sized phosphors concurrently satisfying high brightness and long-term durability to accommodate mini-LED chips. Herein, a two-step facile approach combining high-temperature sintering and mechanochemical milling is proposed to obtain small-sized β-Sialon:Eu nitride phosphors (D50 = 3.13 μm) with a five-fold increase in quantum efficiency (QE, 16% → 79%) and a superb on chip durability with 100% maintenance of QE for 1400 h. The high performance is attributed to the increased Eu2+ percentage (67% → 77%) and the unaltered chemical stiffness after the mechanochemical processing. Crucially, β-Sialon:Eu film made from small-sized powders shows higher packaging density and better light uniformity, concomitantly with an improved QE of 83%. Moreover, this approach is generally applicable to other robust nitride phosphors. By using small-sized β-Sialon:Eu and (Sr,Ca)AlSiN3:Eu films, as-fabricated mini-LED backlights simultaneously achieve a superhigh brightness of 302,150 nits and an ultralong durability exceeding 2,000 h, opening up an avenue for mini-LED backlit displays being a viable technology for high-end applications.
ISSN:1369-7021
1873-4103
DOI:10.1016/j.mattod.2023.10.001