High-efficiency Technology of White OLEDs

Abstract

High-performance all-phosphorescent white devices on a light outcoupling substrate which comprised high-index materials were investigated. The two-unit device composed of the red/blue and red/green phosphorescent units on the light outcoupling substrate achieved high light coupling efficiency of 49%. An electrically and optically optimized two-unit of all phosphorescent white OLED realized low driving voltage of 5.5 V, high luminous efficacy of 114 lm/W and half decay lifetime of over 120,000 h at 1,000 cd/m 2 .

Omnidirectional Reflector based on Transparent Oxide Materials for Light Extraction Enhancement of Organic and Inorganic Solid-state Light Emitting Devices

“…The research group of Panasonic has also reported several methods to enhance the LEE. For example, highly efficient OLED devices by employing the highly refractive substrate like PEN (polyethylene naphthalate) film and the micro lens array structure which is fabricated by highly refractive polymer materials were studied [15][16][17][18][19][20]. In addition, highly reflective electrode to maximize synergy effect of microstructure was investigated.…”

A simple estimation of OLED light extraction enhancement due to refractive modulation lattice diffraction

“…5) The other is an in-plane decoration of the layers. Numerical examples have been proposed including, a diffraction lattice, 6) plasmonic crystals, 7) periodic corrugation, 8) photonic crystals, 9,10) micro-lens or randomphased arrays, [11][12][13][14][15][16][17] and scattering. [18][19][20] The theoretical design methods include geometrical ray tracing, 12) a Monte Carlo method, 15) and rigorous coupling wave analysis (RCWA).…”