A New Mode of Energy Transfer between Mn2+ and Eu2+ in Nitride‐Based Phosphor SrAlSi4N7 with Tunable Light and Excellent Thermal Stability. Issue 18 (20th August 2018)

• Record Type: Journal Article
• Authors: Ding, Jianyan; Seto, Takatoshi; Wang, Yichao; Cao, Yaxin; Li, Hua; Wang, Yuhua
• Is Part Of: Chemistry, an Asian journal. Volume 13:Issue 18(2018)
• Page Start: 2649
• Page End: 2663
• Publication Date: 2018-08-20
• Subjects: density functional calculations -- energy transfer -- lanthanides -- luminescence -- nitrides; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/asia.201800937
• Languages: English
• ISSNs: 1861-4728

Abstract

Abstract: In this work, reciprocal energy transfer between Mn 2+ and Eu 2+ ions in nitride SrAlSi4 N7 has been found and investigated in detail. In contrast to Mn 2+ ‐ and Eu 2+ ‐activated oxide‐based phosphors, the red light centered at 608 nm is ascribed to 4f–5d transitions of Eu 2+ ions and Mn 2+ ‐activated SrAlSi4 N7 emits a cyan light peaking at 500 nm. Additionally, the special broad excitation band of SrAlSi4 N7 :Mn 2+ centered at 362 nm has been covered by that of Eu 2+ ions ranging from 300 to 550 nm. The overlap of the energy level of Mn 2+ and Eu 2+ ions creates the conditions for reciprocal energy transfer between Eu 2+ and Mn 2+ ions. A series of SrAlSi4 N7 :0.002 Mn 2+, x Eu 2+ (0≤ x ≤005) with tunable light emission have been synthesized and the decay curves of samples prove the reciprocal occurrence of the energy transfer between Mn 2+ and Eu 2+ ions. This mode of energy transfer not only prevents the loss of energy, but also improves the thermal stability, and the intensity of SrAlSi4 N7 :Mn 2+, Eu 2+ at 150 °C is still beyond 92 % of the initial intensity. The results provide a new mode of energy transfer, which is expected to reduce the drawbacks existing in energy transfer. Abstract : A glowing report : Reciprocal energy transfer between Mn 2+ and Eu 2+ ions has been found in SAlSi4 N7 (see figure). Preventing the loss of energy during energy transfer is a key problem for single‐phase white‐light‐emitting phosphors; these nitride‐based phosphors provide a new mode of energy transfer, which is expected to reduce the drawbacks existing in energy transfer.