Site Occupation and Luminescence of Novel Orange-Red Ca3M2Ge3O12:Mn2+,Mn4+ (M = Al, Ga) Phosphors,ACS Sustainable Chemistry & Engineering

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Site Occupation and Luminescence of Novel Orange-Red Ca3M2Ge3O12:Mn2+,Mn4+ (M = Al, Ga) Phosphors
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-02-21 , DOI: 10.1021/acssuschemeng.9b07281
Langping Dong _{1,

2} , Liang Zhang _{1,

2} , Yongchao Jia ₃ , Baiqi Shao ₁ , Wei Lü ₁ , Shuang Zhao _{1,

2} , Hongpeng You _{1,

2}

Affiliation

Novel orange-red-emitting phosphors Ca₃M₂Ge₃O₁₂:Mn²⁺,Mn⁴⁺ (M = Al, Ga) with sufficient red light component were developed, and their lattice occupancy and luminescent properties of different color centers have been studied. In Ca₃M₂Ge₃O₁₂:Mn, the abnormal self-reduction of Mn⁴⁺ to Mn²⁺ occurs. The doped manganese ion (using MnO₂ as Mn source) occupies dodecahedron Ca²⁺ site forming Mn²⁺(I) color center with orange emission, while it occupies octahedral Al³⁺/Ga³⁺ site forming Mn²⁺(II) and Mn⁴⁺ color centers with red and deep red light emission. The thermal quenching properties show that Ca₃M₂Ge₃O₁₂:Mn (M = Al, Ga) samples have low thermal quenching, and the thermal quenching of Mn²⁺(I) is lower than that of Mn²⁺(II) due to existence of more defects nearby the Mn²⁺(II) providing additional nonradiative recombination decay path. Ca₃Al₂Ge₃O₁₂:Mn has a lower thermal quenching than Ca₃Ga₂Ge₃O₁₂:Mn because the former possesses higher rigidity. The obtained results reveal that Ca₃M₂Ge₃O₁₂:Mn²⁺,Mn⁴⁺ (M = Al, Ga) has potential practical value in WLEDs. Moreover, the luminescence of Mn²⁺ and Mn⁴⁺ ions in a matrix provides a new strategy for designing and synthesizing new luminescent materials.

中文翻译：

新型橙红色Ca ₃ M ₂ Ge ₃ O ₁₂：Mn 2 ⁺，Mn ⁴⁺（M = Al，Ga）荧光粉的位点占据和发光

新型的橙红色荧光粉Ca ₃ M ₂ Ge ₃ O ₁₂：Mn 2 ⁺，Mn ⁴⁺（M = Al，Ga）具有足够的红光成分，并且其晶格占有率和不同色中心的发光特性具有经过研究。在Ca ₃ M ₂ Ge ₃ O ₁₂：Mn中，发生Mn ⁴⁺向Mn ²⁺的异常自还原。掺杂的锰离子（使用MnO ₂作为Mn源）占据十二面体Ca ²⁺位置，形成Mn ²⁺（I）具有橙色发射的色心，而它占据形成Mn ²⁺（II）的八面体Al ³⁺ / Ga ³⁺位点和具有红色和深红色发光的Mn ⁴⁺颜色中心。热淬火性能表明，Ca ₃ M ₂ Ge ₃ O ₁₂：Mn（M = Al，Ga）样品的热淬火性低，并且Mn ²⁺（I）的热淬火性比Mn ²⁺（II ）的低）由于在Mn ²⁺（II）附近存在更多缺陷，从而提供了额外的非辐射复合衰变路径。Ca ₃ Al ₂ Ge ₃ O ₁₂：Mn比Ca ₃ Ga ₂ Ge ₃ O ₁₂：Mn具有较低的热淬火，因为前者具有较高的刚性。所得结果表明，Ca ₃ M ₂ Ge ₃ O ₁₂：Mn 2 ⁺，Mn ⁴⁺（M = Al，Ga）在WLED中具有潜在的实用价值。此外，基质中Mn ²⁺和Mn ⁴⁺离子的发光为设计和合成新的发光材料提供了新的策略。

更新日期：2020-02-21

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