With nearly 20% of global electricity consumed by lighting, more efficient illumination sources can enable massive energy savings. However, effectively creating the high-quality white light required for indoor illumination remains a challenge. To accurately represent color, the illumination source must provide photons with all the energies visible to our eye. Such a broad emission is difficult to achieve from a single material. In commercial white-light sources, one or more light-emitting diodes, coated by one or more phosphors, yield a combined emission that appears white. However, combining emitters leads to changes in the emission color over time due to the unequal degradation rates of the emitters and efficiency losses due to overlapping absorption and emission energies of the different components. A single material that emits broadband white light (a continuous emission spanning 400–700 nm) would obviate these problems.

中文翻译：

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层状卤化物钙钛矿的白光发射

照明消耗了全球20％的电力，因此更高效的照明源可以节省大量能源。然而，有效地产生室内照明所需的高质量白光仍然是一个挑战。为了准确表示颜色，照明源必须向光子提供肉眼可见的所有能量。用单一材料很难实现如此广泛的发射。在商用白光源中，一个或多个被一个或多个磷光体覆盖的发光二极管产生看起来呈白色的组合发射。然而，由于发射器的不相等的降解速率以及由于不同组分的吸收和发射能量的重叠而导致的效率损失，组合发射器导致发射颜色随时间变化。