Electron Spin Resonance Study on Local Structure of Manganese Ions Doped in Gamma-Aluminum Oxynitride Phosphors
Electron Spin Resonance Study on Local Structure of Manganese Ions Doped in Gamma-Aluminum Oxynitride Phosphors
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DOI：
10.2150/jlve.36.6
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发表时间：
2012-04
期刊：
影响因子：
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通讯作者：
M. Kitaura;Ai Harima;R. Xie;T. Takeda;N. Hirosaki;A. Ohnishi;M. Sasaki
中科院分区：
文献类型：
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作者：
M. Kitaura;Ai Harima;R. Xie;T. Takeda;N. Hirosaki;A. Ohnishi;M. Sasaki
用电子自旋共振（ESR）方法研究了锰离子掺杂的γ -AlON：Mn荧光粉的局域结构。在γ -AlON：Mn的ESR谱中出现了六个尖锐的峰和五个弱的双峰。这些结构是由3d电子与自旋I = 5/2的55 Mn核的超精细相互作用引起的。这六个峰是由于Ms =（cid：156）1/2的超精细分裂态之间的允许跃迁（Δ MI = 0）。这五个双峰被解释为超精细分裂态之间的禁戒跃迁（Δ MI =（cid：156）1）。γ -AlON：Mn的光谱特征与Mn 2 +掺杂MgAl 2 O 4尖晶石的ESR谱相似，Mn 2 +取代了Mg 2 +的四面体位置。由于γ -AlON也是尖晶石结构，推测Mn 2 +离子占据四面体Al 3 +位置.进一步研究了Mg 2 +共掺杂对γ -AlON中Mn 2 +离子ESR谱的影响，以阐明Mg 2 +共掺杂对γ -AlON：Mn，Mg发光的增强作用。结果表明，Mg 2 +共掺杂使四面体Al 3 +位上的Mn 2 +离子增多。
We have studied the local structure of manganese ion doped in gamma aluminum oxynitride phosphors ( γ -AlON: Mn) using electron spin resonance (ESR) experiment. Six sharp peaks appear in ESR spectra of γ -AlON: Mn, together with five weak doublets. These structures are caused by the hyperfine interaction of 3 d electrons with the 55 Mn nucleus of spin I = 5/2. The six peaks are attributed to the allowed transitions (Δ M I = 0) between hyperfine splitting states of M s =(cid:156) 1/2. The five doublets are interpreted as the forbidden transitions (Δ M I =(cid:156) 1) between the hyperfine splitting states. The spectral feature of γ -AlON: Mn resembles with the ESR spectrum of Mn 2 + doped MgAl 2 O 4 spinel, in which Mn 2 + ions are substituted for tetrahedral Mg 2 + sites. Since γ -AlON is also of the spinel structure, it is suggested that Mn 2 + ions occupy tetrahedral Al 3 + sites. We further chased the effect of Mg 2 + co-doping on ESR spectra of Mn 2 + ions in γ -AlON, in order to elucidate the luminescence enhancement in γ -AlON: Mn, Mg. It turned out that the Mg 2 + co-doping increases Mn 2 + ions at tetrahedral Al 3 + sites.