Abstract
White organic light-emitting diodes (WOLEDs) with higher performance, which have enjoyed application in high-quality lighting sources, are here demonstrated with improved optical and electrical properties. The integration of a novel transparent distributed Bragg reflector (DBR), which consists of periodically alternating layers of atomic layer deposition-fabricated ZrO2/Zircone films and sputtered tin-doped indium oxide into OLEDs microcavities were studied to obtain four-peak electroluminescence (EL) spectra. Three types of OLEDs with two-peak, three-peak, and four-peak EL spectra have been developed. The results of the two-peak spectra show that the DBR structures have an outstanding effect on carrier capture; as a result, the device exhibits a stronger stability in color at various applied voltages. The Commission Internationale de L’Eclairage (CIE) coordinates of the two-peak device at 5–13 V shows few displacements and a negligible slight variation of (±0.01, ±0.01). In addition, the four-peak WOLED also yields a high color purity white emission as the luminance changes from 100 cd m−2 to 10,000 cd m−2.
Highlights
Organic light-emitting diodes (OLEDs) have drawn considerable commercialization attention as an efficient generation of full-color flat-panel displays, as well as a solid-state lighting technology, because they have good flexibility, a fast response time, wide viewing angle, and low operation voltage [1,2,3,4]
By using the optimized thickness of the microcavity, three types of white OLEDs (WOLEDs) are realized with two-peak, three-peak, and four-peak EL spectra, and the results show that the distributed Bragg reflector (DBR) structure can simultaneously enhance the intensity of emission while narrowing the spectra
Conclusion, WOLEDs have been been using in the microcavity structure high-performance to enhance the intensity of emission as wellsuccessfully as to narrowmade the spectra
Summary
Organic light-emitting diodes (OLEDs) have drawn considerable commercialization attention as an efficient generation of full-color flat-panel displays, as well as a solid-state lighting technology, because they have good flexibility, a fast response time, wide viewing angle, and low operation voltage [1,2,3,4]. Organic materials emit light with a very broad spectrum and width due to the vibration sidebands and the strongly uneven broadening of electronic transitions, significantly lowering the device color purity. From this viewpoint, the use of an optical microcavity can effectively solve the poor color purity associated with broad emission characteristics [8,9,10]. The microcavity architecture is incorporated into OLEDs, and the emission of the device is coupled to the cavity mode, which greatly improves the emission directionality and the intensity of light, leading to high color purity [11,12]
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