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A binary mixture solution of blue and green CsPbBr3 QDs was prepared without anion-exchange issues to realize CsPbBr3 QDLEDs with dual-emission peaks, and adding red CdSe QDs to obtain a white LED with CIE coordinates of (0.34, 0.33) was achieved.

Perovskite white light-emitting diodes were realized by using a mixture of sky-blue MAPb(Br0.6Cl0.4)3 and orange-red rhodamine 6G as the emissive layer. The influences of rhodamine 6G on the properties of perovskite films were investigated using absorption spectroscopy, steady-state and time-resolved photoluminescence spectroscopy, X-ray diffraction, scanning electron microscopy and confocal laser-scanning fluorescence microscopy. The emissions from MAPb(Br0.6Cl0.4)3 and rhodamine 6G were mixed to realize white light. The CIE chromaticity coordinates of (0.33, 0.4) and (0.36, 0.40) were obtained for devices with 2 wt% and 3 wt% rhodamine 6G, respectively.

Perovskite light-emitting diodes (LEDs) are attractive because of their high efficiency and narrow emission. However, most of the current research on perovskite LEDs with primary color emission is focused on performance enhancement. Only a few studies focused on perovskite white LEDs. Here, we realized a perovskite white light-emitting diode with a single emissive layer by mixing the emission from a sky-blue perovskite material and an orange-near infrared (NIR) organic compound. Compounds with orange-NIR emission are synthesized and the influence of the compounds on the perovskite films is investigated by absorption and photoluminescence spectroscopy, X-ray diffraction, scanning electron microscopy and confocal laser-scanning fluorescence microscopy. Perovskite white LEDs were realized with CIE chromaticity coordinates of (0.3, 0.49), which are approaching the ideal pure white emission coordinates (0.33, 0.33).