School of Mechanical Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Korea.
Nanotechnology. 2013 Dec 20;24(50):505714. doi: 10.1088/0957-4484/24/50/505714. Epub 2013 Nov 27.
The long-term stability of quantum dot (QD)-based devices under harsh environmental conditions has been a critical bottleneck to be resolved for commercial use. Here, we demonstrate an extremely stable QD/alumina/polymer hybrid structure by combining internal atomic layer deposition (ALD) infilling with polymer encapsulation. ALD infilling and polymer encapsulation of QDs synergistically prohibit the degradation of QDs in terms of optical, thermal and humid attacks. Our hybrid QD/alumina/polymer film structure showed no noticeable reduction in photoluminescence even in a commercial grade test (85% humidity at 85°C) over 28 days. In addition, we successfully fabricated a QD-based light-emitting device with excellent long-term stability by incorporating hybrid QD/alumina/polymer film as a color conversion material on light-emitting diode chips.
基于量子点（QD）的器件在恶劣环境条件下的长期稳定性一直是商业应用中需要解决的关键瓶颈。在这里，我们通过结合内部原子层沉积（ALD）填充和聚合物封装，展示了一种极其稳定的 QD/氧化铝/聚合物混合结构。ALD 填充和聚合物封装协同作用，从光学、热和湿攻击方面阻止了 QD 的降解。我们的混合 QD/氧化铝/聚合物薄膜结构在 28 天的时间里，即使在商业级测试（85°C 下 85%的湿度）中，也没有观察到光致发光明显降低。此外，我们成功地在发光二极管芯片上作为颜色转换材料，将混合 QD/氧化铝/聚合物薄膜制备成基于 QD 的发光器件，展示了其优异的长期稳定性。
