A thermally stable narrow-band green phosphor Na2MgAl10O17: Eu2+, Mn2+ for NUV LED application

• Published in: Ceramics international 2024-11, Vol.50 (22), p.47604-47611
• Main Authors: Zhang, Jiahui, Huang, Wenjing, Zeng, Linyun, Li, Chunli, Kolesnikov, Ilya E., Umar, Zafari, Chen, Peican, Zhou, Liya, Liu, Wei, Zhang, Xinguo
• Format: Article
• Language: English
• Subjects: Green phosphor; Mn2+ sensitization; Thermally stable emission; White LEDs
• ISSN: 0272-8842
• DOI: 10.1016/j.ceramint.2024.09.106

Thermally stable narrow-band green phosphor is important for phosphor-converted light emitting diodes (pc-LEDs). Herein, an efficient and stable Na2MgAl10O17: Eu2+, Mn2+ green phosphor is obtained using Eu2+-Mn2+ energy transfer strategy. The Mn2+ activator could be effectively sensitized by the addition of Eu2+ with significant UV absorption enhancement, then generates a bright green emission with peak at 515 nm and FWHM of 40 nm. The internal and external quantum efficiencies of optimal phosphor Na2MgAl10O17: 0.15Eu2+, 0.50Mn2+ are measured as 69.5 and 30.8 %, respectively. It is found that Na2MgAl10O17: Eu2+, Mn2+ phosphor shows good chemical and thermal stability, i.e. maintains no quenching after H2O/HCl soaking and keeps 90 % of RT intensity at 200 °C. By using Na2MgAl10O17: Eu2+, Mn2+ as converted phosphor, single-chromatic and white pc-LEDs were fabricated, which simultaneously achieve green and white emission with high brightness. Our results show that this Na2MgAl10O17: Eu2+, Mn2+ is a potential candidate as a thermally stable green phosphor for white LEDs.