Luminescence characteristics of potassium sulphate (K₂SO₄) crystals doped with thallium were studied. Crystals were grown from water solution at slightly elevated temperature. The nature and properties of the luminescence centres in these crystals have been determined. The main monovalent thallium luminescence centres show the absorption peak at 216 nm and emission one peaking at 285 nm at room temperature. Thallium is substituting potassium which has two different positions in K₂SO₄ structure. Consequently, two different Tl⁺ centers were found for thallium centers in these crystals and the third center includes an unspecified perturbation agent nearby. Tl⁺ centers differ in radiative lifetime at low temperatures and in temperature dependence of decay times measured within 8—300 K.
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机译：研究了th掺杂的硫酸钾（K 2 SO 4）晶体的发光特性。在稍微升高的温度下从水溶液中生长晶体。已经确定了这些晶体中发光中心的性质和性质。在室温下，主要的一价th发光中心在216 nm处出现吸收峰，在285 nm处出现一个发射峰。 hall取代了钾，钾在K 2 SO 4结构中具有两个不同的位置。因此，在这些晶体中的centers中心中发现了两个不同的Tl⁺中心，而第三个中心附近有一个未指明的扰动剂。 Tl⁺中心在低温下的辐射寿命和在8-300 K范围内测得的衰变时间的温度依赖性不同。
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