Tb, Eu Co-doped CsPbBr QDs Glass with Highly Stable and Luminous Adjustable for White LEDs.

Herein, we have introduced rare-earth cations Tb and Eu into CsPbBr QDs glass by conventional melt-quenching. Rare-earth cations like Tb emit green light, causing the main peak of bromide lead cesium to exhibit some redshift, owing to the energy transfer between CsPbBr and Tb. To achieve adjustable light, Eu emits red light, which was doped in this glass with different proportions to solve the problem of red deficiency. More importantly, Tb and Eu co-doped CsPbBr QDs glass shows a series of desirable characteristics due to the energy transfer between Tb and Eu. Interestingly, the blue light radiated by blue chip can excite Tb, Eu, and CsPbBr perovskite effectively. We acquired high-performance white light-emitting diodes with color-rendering index, color coordinate transformation, and luminous efficiency of 85.7, 4945 K, and 63.21 lm/W under the current of 20 mA. This acquired Tb, Eu co-doped CsPbBr QDs glass proved the significant feasibility of luminescent materials in solid warm light source.