Photoluminescent properties of red-emitting phosphor BaMgAl10O17:Cr3+ for plant growth LEDs

• Published in: Optical materials 2020-10, Vol.108, p.110207, Article 110207
• Main Authors: Huyen, N.T., Tu, N., Tung, D.T., Trung, D.Q., Anh, D.D., Duc, T.T., Nga, T.T.T., Huy, P.T.
• Format: Article
• Language: English
• Subjects: BAM; Cr3; Gel method; Phosphor material; Plant growth LED; Sol
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2020.110207

Narrow-band red-emitting phosphor Cr3+-doped BaMgAl10O17 (BAM) was successfully synthesized via a sol – gel method. The obtained Cr3+-doped BaMgAl10O17 phosphor with average particle size of about 1 μm emits an intense red light at around 695 nm with two broad excitation bands at 405 and 560 nm. The highest PL intensity is achieved at the Cr3+ doping concentration of 1 mol% and the annealing temperature of 1400 °C. The Tanabe-Sugano diagram reveals that Cr3+ ions are affected by the strong crystal field with the Dq/B ratio value of ~2.7, and the peak at 695 nm is attributed to the 2E→4A2 transitions of Cr3+ ions. A purple LED with colour coordinates of (0.263, 0.148) has been fabricated by coating the Cr3+-doped BaMgAl10O17 phosphor on a violet LED (410 nm) chip. The results indicate that BaMgAl10O17:Cr3+ phosphor could be promising red phosphor for plant growth LEDs. [Display omitted] •Narrow red-emitting BaMgAl10O17:Cr3+phosphors were synthesized by a simple sol-gel method.•Optimum PL intensity achieved at 1%Cr3+ and annealing temperature of 1400 °C.•The Cr3+ ions are found to affect by the strong crystal field with the Dq/B ratio value of ~2.7.•A novel purple-LED prototype with CIE coordinates of (0.2629, 0.148) was fabricated.