Sunlight-like white organic light-emitting diodes with inorganic/organic nanolaminate distributed Bragg reflector (DBR) anode microcavity by using atomic layer deposition

• WOLED with ZrO2/Zircone DBR has been firstly prepared by atomic layer deposition.
• Three color-tunable white light diodes were realized by well adjusting the thickness and emissive dyes.
• The microcavity OLED achieved purer emission, and the off-resonant optical mode was highly suppressed.
• The CIE chromaticity coordinates of devices were tuned from (0.33, 0.34), (0.43, 0.40) to (0.57, 0.40).
• The color temperature was adjusted from 5783 K, 3842 K–2245 K.

White organic light-emitting diodes (WOLED) with inorganic/organic/hybrid nanolaminate distributed Bragg reflector (DBR) prepared by atomic layer deposition (ALD) has been firstly developed, and the improved structural, optical, and electrical properties have been observed. The functional layer consists of periodically alternating layers of ZrO2/Zircone (zirconium alkoxides with carbon-containing backbones) films fabricated using ALD. By well adjusting the thickness and emissive dyes of the emission layer, three white light diodes were realized based on three cavity modes with different resonance wavelength and intensity. The narrowed lectroluminescent (EL) spectra from the microcavity organic light emitting diodes (MOLEDs) are of high-purity, and the off-resonant optical mode is highly suppressed due to the excellent optical properties of the DBR layers with high reflectivity in a wide stop-band range. The CIE chromaticity coordinates of devices are tuned from (0.33, 0.34), (0.43, 0.40) to (0.57, 0.40), which are all on the planckian locus, and the color temperature is adjusted from 5783 K, 3842 K to 2245 K. This work exhibits a simple and novel approach to achieve a sunlight-like WOLED by constructing the inorganic/organic nanolaminate DBR using ALD, which will be very important for healthy display and lighting.

A simple alternative approach to fabricate ZrO2/Zircone nanolaminate DBR structure by ALD, and the resultant sunlight-like WOLEDs achieve broad color-temperature range.Figure optionsDownload as PowerPoint slide