The application of graphitic carbon nitride (g‐C₃N₄) has been restricted in some optoelectronics fields due to its narrow tunable emission region. In order to engineer the optical properties, herein we combine Eu³⁺:Y₂O₃ nanocrystals with g‐C₃N₄to control its electronic structure. Surprisingly, with the increasing concentration of Eu³⁺:Y₂O₃ nanocrystals, the photoluminescence of Eu³⁺:Y₂O₃/g‐C₃N₄ (EYCN) showed a continuous red shift in comparison with pure g‐C₃N₄ from blue to green. In EYCN composites, the Eu³⁺:Y₂O₃ nanocrystals as electron donors, can improve the degree of electron delocalization and narrow the bandgap. Importantly, the EYCN composites not only maintain the intrinsic blue‐green emission of g‐C₃N₄, but also introduce the red light of Eu³⁺ ions. Based on the EYCN composites, white light‐emitting diode (WLED) were fabricated with a Commission International de L’Eclairage value of (0.3631, 0.3560). This work proposes a new kind of luminescent g‐C₃N₄‐based composites, which is expected to broaden its applications in optoelectronics field.

中文翻译：

---

具有可调荧光的Eu3 +掺杂Y2O3纳米晶体/ g-C3N4复合材料的可控合成

石墨氮化碳（g-C ₃ N ₄）的应用由于其狭窄的可调发射区域而在某些光电领域受到限制。为了设计光学性能，我们在这里将Eu ³⁺：Y ₂ O ₃纳米晶体与g-C ₃ N _{4结合起来}以控制其电子结构。令人惊讶的是，随着Eu ³⁺：Y ₂ O ₃纳米晶体浓度的增加，Eu ³⁺：Y ₂ O ₃ / g-C ₃ N ₄的光致发光（EYCN）与纯g‐C ₃ N _4相比，从蓝色到绿色显示出连续的红移。在EYCN复合材料中，作为电子给体的Eu ³⁺：Y ₂ O ₃纳米晶体可以提高电子离域度并缩小带隙。重要的是，EYCN复合材料不仅保持了g‐C ₃ N ₄固有的蓝绿色发射，而且还引入了Eu ³⁺离子的红光。在EYCN复合材料的基础上，制造了白光发光二极管（WLED），其国际照明标准委员会数值为（0.3631，0.3560）。这项工作提出了一种新型的发光g‐C ₃ N ₄基复合材料，有望扩大其在光电领域的应用。