Work

Color‐Stable, All‐Phosphorescent White Organic Light Emitting Diodes Using the Polariton‐Enhanced Purcell Effect

Year: 2024

Type: article

Abstract: The short operational lifetimes of high efficiency phosphorescent organic blue light emitting devices (PHOLEDs) has limited their use in displays and lighting. Previously, this problem has been avoided by using less efficient fluorescent blue devices in separately biased red, green, and blue emissive elements to achieve stable full color emission. However, the operational lifetime of blue phosphorescent OLEDs has been significantly improved through the utilization of the plasmon‐exciton‐polariton‐enhanced (PEP) Purcell effect. Here, a white emitting PHOLED comprising stacked red, green, and blue elements is demonstrated that exploits PEPs to extend the operational lifetime of the blue element such that all emissive layers degrade at the same rate. The device features white light emission with an external quantum efficiency of 19.1 ± 0.4%, luminous power efficiency of 13.3 ± 0.3 lm W−1 at a luminance of 1000 cd m−2 when measured over 4π solid angle, with a color rendering index of 76 unchanged throughout the device aging to 70% of its initial luminance, T70. A 2.9 times enhancement in the operational lifetime of the Purcell‐enhanced device is achieved to yield T70 = 2900 ± 100 h for an initial luminance of 1000 cd m−2, compared to devices lacking this enhancement with T70 = 1000 ± 100 h.

Source: Advanced Functional Materials

DOI: 10.1002/adfm.202410741

Authors: Claire Ε. Arneson, Haonan Zhao, Stephen R. Forrest

Institution: University of Michigan

Language: English

Topic: Organic Light-Emitting Diodes Research

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $5,510

Funders: U.S. Department of Energy, Universal Display Corporation, Office of Energy Efficiency and Renewable Energy, Office of Energy Efficiency