Optical Materials ( IF 3.9 ) Pub Date : 2021-09-16 , DOI: 10.1016/j.optmat.2021.111587 Do Quang Trung 1, 2, 3 , Manh-Trung Tran 4 , Nguyen Duy Hung 5 , Quang Nguyen Van 6 , Nguyen Thi Huyen 6 , Nguyen Tu 1, 2, 3 , Huy Pham Thanh 4
The development of emission-tunable structures opens an optimistic future for white light-emitting diodes (WLED) utilizing a UV pump. Herein, we report emission-tunable Mn-doped ZnS/ZnO heterostructure nanobelts synthesized by the thermal evaporation method, following by an appropriate oxidation process. Under the UV excitation of 330 nm, the as-received nanobelts show an orange-yellow light with CCT of 3056 K, the 500 and 700 °C-oxidized samples strongly exhibit a warm white light emission with CCT of 3393 K and 3551 K, respectively. Surprisingly, the Mn-doped ZnS/ZnO heterostructures oxidized at 600 °C show a white light emission with CIE chromaticity coordinate of (0.31, 0.39) and CCT value of 6290 K, which are nearly very close to that of the commercial YAG:Ce3+ phosphor. A prototype WLED with the color coordinates of (0.33, 0.45), the CCT of 5491 K, and the QE ∼ 61% was successfully fabricated using Mn-doped ZnS/ZnO heterostructure nanobelts coated on the surface of UV (370 nm) chip. The obtained Mn-doped ZnS/ZnO heterostructures are promising to be applied in UV-pumped WLED fabrication.
中文翻译:
用于紫外泵 WLED 的发射可调 Mn 掺杂 ZnS/ZnO 异质结构纳米带
发射可调结构的发展为利用紫外线泵的白光发光二极管 (WLED) 开辟了乐观的未来。在此,我们报告了通过热蒸发法合成的发射可调的 Mn 掺杂 ZnS/ZnO 异质结构纳米带,然后是适当的氧化过程。在 330 nm 的紫外激发下,原样的纳米带显示橙黄色光,CCT 为 3056 K,500 和 700 °C 氧化的样品强烈显示出暖白光发射,CCT 为 3393 K 和 3551 K,分别。令人惊讶的是,在 600 °C 下氧化的 Mn 掺杂的 ZnS/ZnO 异质结构显示出白光发射,CIE 色度坐标为 (0.31, 0.39) 和 CCT 值为 6290 K,几乎非常接近商业 YAG:Ce 3+磷。使用涂覆在 UV (370 nm) 芯片表面的 Mn 掺杂 ZnS/ZnO 异质结构纳米带成功制造了色坐标为 (0.33, 0.45)、CCT 为 5491 K 和 QE ∼ 61% 的原型 WLED。获得的 Mn 掺杂的 ZnS/ZnO 异质结构有望应用于 UV 泵浦 WLED 制造。