The correlation between the optimal performance of indoor photovoltaics (IPVs) and spectral characteristics of white light-emitting diode (LED) sources has been investigated theoretically. We calculated the Schockley–Queisser limit of IPVs under multi-color white LEDs with different correlated color temperature (CCT), color rendering index (CRI) and luminous efficacy of radiation (LER). It is found that the optimal bandgap for an IPV cell is not only influenced by CCT, but also by LER and CRI. However, the main factor that affects the maximum power conversion efficiency (PCE) is CCT, and the maximum PCE is relatively independent of the CRI and LER under the same condition of CCT. The maximum PCE decreases with the increase of CCT. Based on the analysis of the energy loss within IPVs, it is found that the value of the optimal bandgap is sensitive to the fraction of red light in the spectrum of white LEDs. The maximum PCE is primarily limited by the relaxation to band edge loss, which is caused by the high-energy blue or cyan light in the spectrum of white LEDs.

从理论上研究了室内光伏 (IPV) 的最佳性能与白光发光二极管 (LED) 光源的光谱特性之间的相关性。我们计算了具有不同相关色温 (CCT)、显色指数 (CRI) 和辐射发光效率 (LER) 的多色白光 LED 下 IPV 的 Schockley-Queisser 极限。研究发现，IPV 电池的最佳带隙不仅受 CCT 的影响，还受 LER 和 CRI 的影响。但是，影响最大功率转换效率（PCE）的主要因素是CCT，在CCT相同的条件下，最大PCE与CRI和LER相对独立。随着 CCT 的增加，最大 PCE 降低。基于对 IPV 内能量损失的分析，发现最佳带隙值对白光 LED 光谱中红光的比例敏感。最大 PCE 主要受限于带边损耗的弛豫，这是由白光 LED 光谱中的高能蓝色或青色光引起的。