66.2: Invited Paper: Highly Efficient White OLEDs with over 100 lm/W for General Lighting

Abstract

High‐performance all‐phosphorescent white devices on a light‐outcoupling substrate which comprised high‐index materials were studied. As a result of suitable optical and electrical design, the device showed an extremely high efficacy of 114 lm/W at 1,000 cd/m2 and 102 lm/W at 3,000 cd/m2.

Recent progress in the use of fluorescent and phosphorescent organic compounds for organic light-emitting diode lighting

“…83 In addition, Panasonic Corp. reported a high PE of 114 lm∕W at 1000 cd∕m 2 and 102 lm∕W at 3000 cd∕m 2 for all of their phosphorescent white OLEDs. 84 Major outcomes of industrial research that were presented in 2014 are as follows. Universal Display Corp. applied a phosphorescent material emitting R, G, B colors and reported a colortunable white OLED lighting panel with high efficiency.…”

Development of Extremely High Efficacy White OLED with over 100 lm/W

“…It is because of the high refractive indices of organic layers and ITO (n ~ 1.8) and glass substrate (n ~ 1.5), and most of generated light are confined within these high refractive-index layers as waveguide and substrate modes due to total internal reflection (TIR) at interfaces. We have already reported highly efficient light outcoupling technology achieved by an originally developed built-up light extraction substrate (BLES) which is composed of high refractive index materials [3][4][5]. Schematic of BLES is depicted in Figure 2.…”

“…Two-unit structure is beneficial to enhance EE and lifetime due to the reduction of current density to obtain desired luminance by almost half. White emission with high CRI required the intensity ratio of red : green : blue emissions as about 2 : 1 : 1 and the two-unit structure composed of the red/blue and red/green phosphorescent units was selected as the low driving voltage system [5]. In order to reduce the evanescent mode, thick (> 100 nm) ETL with high mobility and transparency was applied.…”

P‐148: Highly Conductive PEDOT:PSS Patterning Scheme and its Application to ITO‐free Organic Light Emitting Diodes

“…Since then, OLEDs have drawn much attention in many applications, especially as light sources and display devices. By now, highly efficient OLEDs lighting (> 100 lm/W) was realized [2]. There are also transparent and flexible display prototypes [3,4].…”