Perovskite white light-emitting diodes based on a molecular blend perovskite emissive layer

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Vol. 7; no. 28; pp. 8634 - 8642
• Main Authors: Chang, Che-Yu, Solodukhin, Alexander N, Liao, Shih-Yu, Mahesh, K. P. O, Hsu, Ching-Ling, Ponomarenko, Sergei A, Luponosov, Yuriy N, Chao, Yu-Chiang
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 2019
• Subjects: Absorption; Chromaticity; Diffraction patterns; Emission analysis; Fluorescence; Light emitting diodes; Organic compounds; Organic light emitting diodes; Performance enhancement; Perovskites; Photoluminescence; Scanning electron microscopy; Spectrum analysis; White light; X-ray diffraction
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/c9tc01509d

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). Perovskite white light-emitting diodes with only a single emissive layer were realized with CIE chromaticity coordinates of (0.3, 0.49).