Abstract

A method to synthesize spinel (MgAl₂O₄)–based compounds doped with magnesium ions was developed, which makes it possible to create red-emitting phosphors (band peak at 651 nm) or green-emitting phosphors (band peak at 525 nm) due to the luminescence of Mn⁴⁺ or Mn²⁺, respectively, and also phosphors that have both (red and green) emission bands. Both types of luminescence exhibit quite high thermal stability; particularly, the green luminescence does. Namely, the temperature at which the luminescence intensity halves in comparison with the maximum intensity is T_0.5 = 448 and 737 K for the red (Mn⁴⁺) and green (Mn²⁺) luminescence, respectively. On the other hand, for the phosphors that have both emission bands, the temperature dependences of the intensities of the red and green luminescence more closely resemble each other because of the energy transfer from Mn⁴⁺ ions to Mn²⁺ ions. Both emission bands are efficiently excited in the blue spectral region, which enables the use of the conventional three-color RGB (red–green–blue) method to create LED white-light sources based on a combination of a blue light-emitting diode and a phosphor containing manganese ions with an optimally chosen ratio between the intensities of the green and red emission bands.

中文翻译：

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掺杂锰离子的尖晶石的发光特性

摘要

开发了一种合成掺有镁离子的尖晶石（MgAl ₂ O ₄）基化合物的方法，这使得可以生成红色发光的荧光粉（峰在651 nm）或绿色发光的荧光粉（峰在525 nm）。分别是由于Mn ⁴⁺或Mn ²⁺的发光，以及同时具有（红色和绿色）发射带的磷光体引起的。两种类型的发光都表现出很高的热稳定性；特别是绿色发光。即，对于红色（Mn ⁴⁺）和绿色（Mn ²⁺），发光强度相对于最大强度降低一半的温度为T _0.5 = 448和737K。）分别发光。另一方面，对于具有两个发射带的磷光体，由于从Mn ⁴⁺离子到Mn ²⁺离子的能量转移，红色和绿色发光的强度的温度依赖性彼此更加相似。两个发射带均在蓝色光谱区域内被有效激发，这使得可以使用常规的三色RGB（红-绿-蓝）方法基于蓝光发光二极管和LED的组合来创建LED白光源。一种含有锰离子的荧光粉，其绿色和红色发射带的强度之间具有最佳选择的比率。