Abstract We have successfully fabricated Zn1-xEuxSe (x = 0–0.1) quantum dots (QDs) with an average size of ~5 nm. X-ray diffraction analyses indicated that the zincblende-wurtzite structural transition occurred around x = 0.05. This leads to a small change in value of the band-gap energy Eg from 3.13 eV for x = 0–3.03 eV for x = 0.1. By studying their photoluminescence (PL) spectra, we observed two emission regions. The first one around 400–415 nm is a broad peak associated with the band-edge emission, while the other consists of sharp peaks due to the electronic transitions (5D0 - 7Fj, j = 0–4) of Eu3+ ions in the ZnSe host lattice. Similar to the variation tendency of Eg, the excitonic emission peak also shifts towards low energies when x increases. Among the 5D0 - 7Fj transitions, the radiative transition with j = 2 peaked at 618 nm has the strongest intensity, particularly for x = 008. Time-resolved PL spectra of both emission regions can be described by a multi-exponential decay function. The average time constants of the Eu3+-related emission at 618 nm vary in the range of 2.4–4.8 ms, which is much longer than those recorded for the band-edge emission. We also analyzed the emission features of QDs through the CIE chromaticity coordinates and found the QDs with x = 0.08, showing neutral white light.

中文翻译：

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Eu掺杂对Zn1-xEuxSe量子点结构和光学性质的影响

摘要 我们已成功制造出平均尺寸约为 5 nm 的 Zn1-xEuxSe (x = 0–0.1) 量子点 (QD)。X 射线衍射分析表明闪锌矿-纤锌矿结构转变发生在 x = 0.05 附近。这导致带隙能量 Eg 的值从 x = 0 时的 3.13 eV 变化到 x = 0.1 时的 3.03 eV。通过研究它们的光致发光 (PL) 光谱，我们观察到了两个发射区域。第一个在 400-415 nm 附近是一个与带边发射相关的宽峰，而另一个由尖峰组成，这是由于 ZnSe 主体中 Eu3+ 离子的电子跃迁 (5D0 - 7Fj, j = 0-4)格子。与 Eg 的变化趋势类似，当 x 增加时，激子发射峰也向低能量移动。在 5D0 - 7Fj 转换中，j = 2 在 618 nm 处达到峰值的辐射跃迁具有最强的强度，特别是对于 x = 008。两个发射区域的时间分辨 PL 光谱可以通过多指数衰减函数来描述。618 nm 处 Eu3+ 相关发射的平均时间常数在 2.4-4.8 ms 的范围内变化，这比带边发射记录的时间常数要长得多。我们还通过 CIE 色度坐标分析了 QD 的发射特征，发现 x = 0.08 的 QD，显示中性白光。