55‐2: Methods for Overcoming the Trade‐off between Efficiency and Lifetime of Organic Light‐Emitting Diodes: OLED Lifetime Simulation

Abstract

Next generation OLED displays demand high energy efficiency and high resolution, but it is a hard challenge for the OLED display industry to meet the needs for high efficiency and long lifetime simultaneously. When excitons relax to their ground state a photon is emitted; however, such excited exciton states can, on occasion, quench, leading to material degradation. In order to increase efficiency, a high concentration of excitons is needed, but this leads to more quenching events between excitons and polarons and, in turn, increased material degradation. Thus, a trade-off exists between efficiency and lifetime, which can be alleviated by carefully optimizing the concentration and spatial distribution of excitons. In this paper, we introduce an OLED lifetime model, which we apply to overcome the aforementioned trade-off. In order to develop the model, we first identified the key quenching factors that dominate efficiency and lifetime degradation. Based on these factors, our model can quantitatively predict device degradation. Subsequently, we can optimize the OLED stack, in terms of layer materials and thicknesses, so as to maximize efficiency, while minimizing degradation. Consequently, we demonstrate an optimized device that exhibits a 6% higher efficiency and a 2.7 times extended lifetime relative to the reference device.

61‐1: Heuristics of OLED and Micro LED Efficiencies

“…If the total display emission power is measured, the power per pixel can be calculated from (2) where is the measured display emission power, is the number of pixels per each row of the matrix, and is the number of pixels per each column of the matrix.…”

“…Next generation OLED displays demand high energy efficiency [2][3][4][5][6][7][8][9][10], but it is a hard challenge for the OLED displays to meet the needs for high efficiency, color accuracy, and long lifetime simultaneously [2,[11][12][13][14][15]. Therefore, inorganic LED (ILED or µLED) display technology is under research and development by several companies worldwide [16][17][18][19][20][21][22][23][24][25][26][27][28].…”

A multiunit compensation for organic light‐emitting diode burn‐in in mobile displays

“…The luminance efficiency of an OLED decreases with its usage time. 1 The nonuniform degradation, recognized as the burn-in phenomenon, occurs depending on the amount of accumulated current density delivered to each pixel unevenly in the display panel. This quality degradation can be more serious when an OLED display is used in the high dynamic range (HDR) 2 and under display camera (UDC) applications because these require more current consumption to drive the pixels in high luminance, and therefore, it is more likely to be burned in less time.…”

“…Lifetime degradation still remains as a technical barrier in the organic light‐emitting diode (OLED) display application, despite the advances of organic materials and manufacturing technology. The luminance efficiency of an OLED decreases with its usage time 1 . The nonuniform degradation, recognized as the burn‐in phenomenon, occurs depending on the amount of accumulated current density delivered to each pixel unevenly in the display panel.…”

14‐1: Distinguished Paper: A Multi‐Unit Compensation for OLED Burn‐In in Mobile Displays

“…Lifetime degradation still remains as a technical barrier in the OLED (organic light-emitting diode) display application, despite the advances of organic materials and manufacturing technology. The luminance efficiency of an OLED decreases with its usage time [1]. The non-uniform degradation, recognized as the burn-in phenomenon, occurs depending on the amount of accumulated current density delivered to each pixel unevenly in the display panel.…”