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平面结构的LED器件的外量子效率(EQE)受限于光致发光量子产率(PLQY)、电荷平衡因子、辐射复合激子比例和取出效率四个因素。PeLED中前三个因素均已被优化到接近于1，唯一限制LED器件的EQE的因素是光取出效率。该因子在发光层(EML)厚度为几十个纳米的情况下在20%左右，当EML厚度达到几百个纳米时，减小至不到8%。光子循环效应（光子的再吸收再发射过程）能够随机再发射波导模式中的光子，这将...
由于AlGaN基UV-LED 器件的仍然存在许多技术上的困难和不明的老化机制，这些限制了UV-LED 的寿命可靠性和迅速渗透市场的能力。目前由于UV-LED 老化的物理机制尚未完全确定，引起了广大UV-LED研究人员的极大兴趣。基于这一现状，我们通过I-V、C-V、功率测量和一维模拟系统地研究了265 nm UVC-LEDs在不同恒定电流应力下的老化机理。通过对比实验和模拟器件老化前后载流子的浓度...
PowerPoint&LED Projector Enable New Technique for Self-Folding Origami
PowerPoint LED Projector Enable Technique for Self-Folding Origami
2017/7/19
Researchers at the Georgia Institute of Technology and Peking University have found a new use for the ubiquitous PowerPoint slide: Producing self-folding three-dimensional origami structures from phot...
Group blazes path to efficient,eco-friendly deep-ultraviolet LED
Group eco-friendly deep-ultraviolet LED
2017/3/14
The darkest form of ultraviolet light, known as UV-C, is unique because of its reputation as a killer – of harmful organisms.With wavelengths of between 200 and 280 nanometers, this particular form of...