Characterization, modeling, and analysis of organic light-emitting diodes with different structures

Abstract

CitationThis article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication.

An overview of energy efficient solid state LED driver topologies

“…These converters have high power density with a favourable reduction in the size of switched capacitors. [70][71][72][73][74][75] Thus, these topologies are highly attractive and the various SC converter topologies are shown in Figure 7. On the other hand, organic LEDs need dedicated LED drivers which are expensive compared to the other LEDs.…”

Integration of Optical and Thermal Models for Organic Light-Emitting Diodes

“…It is assumed that the input electric power, P electric , for the OLED device is converted to both optical and thermal power, and that other types of converted energy are negligible. Based on energy conservation theory, the input electric power ideally can be expressed as [9,13]:…”

“…The last term, η rad , can be comprehended as the synthetic results of the photoluminescence of the acceptor and the transfer of singlet and triplet excitons from donors to acceptors [25]. Equations (7) and (9) show also that k light is the synthetic effect of η EE , γ, η S/T , and η rad . The luminescent light then encounters several optical ray-trapping mechanisms, such as the total internal effects in the substrate and other layers, as well as the surface plasma attenuation, etc.…”

“…The simulated maximum and minimum temperatures of the upper cover of the OLED are 31.0 • C and 26.3 • C, respectively. To compare these results with those of the experiment, relative errors for the models were calculated as the ratio of the difference between the measured and simulated values to the measured value [9]. These were 1.3% and 4.6% for the maximum and minimum temperatures, respectively.…”

“…Several studies have constructed models for investigating the optical and thermal properties of OLEDs, with some also accounting for their electrical properties. Such models employ fluid dynamics, successive network reductions, equivalent circuits, spectral power distributions, and so on [2][3][4][5][8][9][10][11][12][13].…”