近红外二区发射荧光粉Li3PO4∶Mn5+的合成与发光性能调控OA
Synthesis and Luminescence Property Modulation of NIR-Ⅱ Emitting Li3PO4∶Mn5+Phosphor
近红外二区(NIR-Ⅱ)荧光由于其更深的穿透深度和更高的成像分辨率,在荧光成像领域具有独特的优势.Mn5+离子具有位于NIR-Ⅱ区精准的超窄带发射特性,然而,由于其价态不稳定性,要实现Mn5+的发光仍然充满挑战.本文利用高温固相法合成Mn掺杂的Li3PO4体系,通过理论计算预测了Mn原子可能的掺杂格位,重点阐述了煅烧温度(600~700℃)和气氛(空气、氧气)对于Mn5+1 120 nm发光强度的影响,明晰了氧气有利于实现Mn5+更强发光的物理机制.最终,获得了具有最优发光性能的样品Li3PO4∶0.01Mn5+(650℃+氧气).基于其良好的热稳定性(T50=435 K),制备了荧光粉转换型近红外LED(NIR pc-LED)器件,探索了光源在防伪信息识别方面的潜在应用.本文有望为高温固相法合成调控Mn5+激活的荧光材料提供研究思路.
The second near-infrared(NIR-Ⅱ)photoluminescence exhibits distinct advantages for imaging due to its deeper penetration and superior resolution.Mn5+features ultra-narrow emission in the NIR-Ⅱ region,however,it still remains challenging to fulfill Mn5+emission due to valence state instability.Mn-doped Li3PO4 compounds are syn‑thesized by conventional high-temperature solid-state reaction method,the possible Mn substitution sites are predict‑ed through density functional theory calculation,the influences of sintering temperature(600~700℃)and atmosphere(Air,O2)on Mn5+1 120 nm emission intensity are investigated in detail,and clarified the physical mechanism of O2 benefiting for improving Mn5+emission.Finally,the optimal composition Li3PO4∶0.01Mn5+(650℃+O2)is obtained.NIR pc-LED is fabricated based on the phosphor's good thermal stability(T50=435 K)and its potential application on anti-counterfeit information identification is explored.This work is expected to provide research thoughts on synthe‑sizing and regulating Mn5+-activated luminescent materials through high-temperature solid-state reaction method.
李雅洁;郭人华;张友明;金正元;景铃胭;宋恩海
深圳信息职业技术大学 未来产业技术研究院,广东 深圳 518172华南理工大学 发光材料与器件全国重点实验室,广东 广州 510614深圳信息职业技术大学 未来产业技术研究院,广东 深圳 518172深圳信息职业技术大学 未来产业技术研究院,广东 深圳 518172深圳信息职业技术大学 未来产业技术研究院,广东 深圳 518172华南理工大学 发光材料与器件全国重点实验室,广东 广州 510614
数理科学
Mn5+NIR-Ⅱ发光调控策略煅烧气氛
Mn5+NIR-Ⅱ emissionmodulation strategiessintering atmosphere
《发光学报》 2026 (8)
1425-1436,12
深圳信息职业技术大学重点研究领域支持科研项目(SUIT2026KJ014)深圳市基础研究专项自然科学基金计划项目(JCYJ20250604182808011)Supported by Key Research Area Support Research Project of Shenzhen University of Information Technology(SUIT2026KJ014)Shenzhen Basic Research Special Program of the Natural Science Foundation(JCYJ20250604182808011)
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