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首页> 外文期刊>RSC Advances >Synthesis, electronic structures, and photoluminescence properties of an efficient and thermally stable red-emitting phosphor Ca3ZrSi2O9:Eu3+,Bi3+ for deep UV-LEDs
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Synthesis, electronic structures, and photoluminescence properties of an efficient and thermally stable red-emitting phosphor Ca3ZrSi2O9:Eu3+,Bi3+ for deep UV-LEDs

机译：高效且热稳定的发红光磷光体Ca3ZrSi2O9：Eu3 +，Bi3 +的合成，电子结构和光致发光特性，适用于深层UV-LED

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A series of red-emitting Ca _(3) ZrSi _(2) O _(9) :Eu ~(3+) , x Bi ~(3+) phosphors was synthesized using a conventional high temperature solid-state reaction method, for the purpose of promoting the emission efficiency of Eu ~(3+) in a Ca _(3) ZrSi _(2) O _(9) host. The site preference of Bi ~(3+) and Eu ~(3+) in the Ca _(3) ZrSi _(2) O _(9) host was evaluated by formation energy. The effects of Bi ~(3+) on electronic structure, luminescent properties, and related mechanisms were investigated. The inner quantum yield of the optimized sample increased to 72.9% ( x = 0.08) from 34.6% ( x = 0) at 300 nm ultraviolet light excitation. The optimized sample ( x = 0.08) also showed excellent thermal stability, and typically, 84.2% of the initial emission intensity was maintained when the temperature increased to 150 °C from 25 °C, which is much higher than that without Bi ~(3+) doping (70.1%). The mechanisms of emission properties and thermal stability enhancement, as well as the redshift of the charge transfer band (CTB) induced by Bi ~(3+) doping in the Ca _(3) ZrSi _(2) O _(9) :Eu ~(3+) phosphor, were discussed. This study elucidates the photoluminescence properties of Bi ~(3+) -doped Ca _(3) ZrSi _(2) O _(9) :Eu ~(3+) phosphor, and indicates that it is a promising luminescent material that can be used in ultraviolet light-emitting diodes.
机译：使用常规的高温固态反应方法合成了一系列发红光的Ca _（3）ZrSi _（2）O _（9）：Eu〜（3+），x Bi〜（3+）荧光粉，目的是为了提高Ca _（3）ZrSi _（2）O _（9）主体中Eu〜（3+）的发射效率。通过形成能评价Ca _（3）ZrSi _（2）O _（9）主体中Bi〜（3+）和Eu〜（3+）的位点偏好。研究了Bi〜（3+）对电子结构，发光性能及相关机理的影响。在300 nm紫外光激发下，优化样品的内部量子产率从34.6％（x = 0）增加到72.9％（x = 0.08）。优化后的样品（x = 0.08）也显示出出色的热稳定性，通常当温度从25°C升至150°C时，初始发射强度可保持84.2％，这比不使用Bi〜（3）时要高得多。 +）掺杂（70.1％）。 Ca _（3）ZrSi _（2）O _（9）中Bi〜（3+）掺杂引起的发射特性和热稳定性增强的机理以及电荷转移带（CTB）的红移：讨论了Eu〜（3+）荧光粉。这项研究阐明了Bi〜（3+）掺杂的Ca _（3）ZrSi _（2）O _（9）：Eu〜（3+）荧光粉的光致发光特性，并表明它是一种有前途的发光材料用于紫外线发光二极管。

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