High-Performance White Organic Light-Emitting Diodes Using Distributed Bragg Reflector by Atomic Layer Deposition

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.

Flexible distributed Bragg reflectors as optical outcouplers for OLEDs based on a polymeric anode

“…DBRs have been extensively used in combination with rigid OLED structures to study their microcavity effects on device performance [19][20][21][22][23][24][25]. Recently, a flexible TOLED was been fabricated on a metal foil substrate by using a DBR as an optical reflector and electrical insulating layer [26].…”

Polylactic acid 3D interconnected nanonetworks as high reflectance distributed Bragg reflectors

“…These properties led to the application of DBRs in, e.g., sensing, photovoltaics, solar concentrators, and highly reflective mirrors. [4][5][6][7][8][9] Typically, DBRs have been produced through physical deposition of high refractive index inorganic materials, such as TiO 2 , SiO 2 , SnO 2 , ZnO, etc. 10,11 These methods generally require costly infrastructure and have low compatibility with large-area fabrication or the use of flexible substrates.…”

Device Modeling of Quantum Dot–Organic Light Emitting Diodes for High Green Color Purity

“…It is also being developed into stretchable and wearable form, so it looks to be very scalable [3][4][5]. In particular, OLED has a fast response speed, high contrast ratio, lightness, and flexible characteristics, so its application product range is very wide, from small-sized devices through medium-sized devices such as notebooks and monitors to large-sized OLED TVs [6][7][8]. Among these OLEDs, currently, quantum dot (QD)-OLED is now attracting considerable attention due to the high color gamut, wide viewing angle, and its many other advantages [9,10].…”