Yu Binhai, Lu Zhou, Liang Guanwei, Yuan Yikai, Wang Hong, He Jinqing, Yang Shu
Opt Express. 2021 Aug 30;29(18):29007-29020. doi: 10.1364/OE.431345.
In this study, a strongly reflective and photoluminescent (PL) poly(lactic-co-glycolic acid) quantum dot (QD) hybrid nanofiber (PQHN) structure is introduced to enhance the luminous efficacy of QD-phosphor hybrid white light-emitting diodes (QD-WLEDs). As the thickness of PQHN film increases, the PL is found to continuously increase, exhibiting a maximum peak intensity at 120 μm, which is 1.92 times that at 12 μm, and showing the highest diffuse reflectance of 94.4% at 640 nm. Consequently, while using the QD-WLEDs, the PQHN structure achieves a 53.8% improvement in luminous flux compared with the traditional structure under a similar correlated color temperature (CCT) of 3,540 K, achieving a high luminous efficacy of 202.11 lm W for QD-WLEDs. In addition, the maximum deviation of the CCT is only 11 K when the current is changed from 50 to 950 mA, demonstrating good stability. Therefore, the PQHN films have great potential in lighting systems as a hybrid functional film including light conversion and reflectance.
在本研究中，引入了一种具有强反射性和光致发光（PL）的聚乳酸-乙醇酸共聚物量子点（QD）混合纳米纤维（PQHN）结构，以提高量子点-磷光体混合白光发光二极管（QD-WLED）的发光效率。随着PQHN薄膜厚度的增加，发现其PL持续增加，在120μm处呈现最大峰值强度，是12μm处的1.92倍，并且在640nm处显示出94.4%的最高漫反射率。因此，在使用QD-WLED时，与传统结构相比，PQHN结构在3540K的相似相关色温（CCT）下，光通量提高了53.8%，实现了QD-WLED的202.11lm/W的高发光效率。此外，当电流从50mA变化到950mA时，CCT的最大偏差仅为11K，显示出良好的稳定性。因此，PQHN薄膜作为一种兼具光转换和反射功能的混合功能薄膜，在照明系统中具有巨大潜力。
