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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Mori, T. Masumoto, Y. |
| Copyright Year | 2007 |
| Description | Author affiliation: Nagoya Univ., Nagoya (Mori, T.; Masumoto, Y.) |
| Abstract | Organic light-emitting diodes (OLEDs) have attractive advantages as flat panel display and flat lighting device. The EL performance of OLED is often described as the external quantum efficiency. The external quantum efficiency is defined as the product of light out-coupling factor, PL quantum efficiency, exciton factor (singlet, 0.25), and carrier balance factor. Carrier balance factor is described as the ratio of recombination current to the current flowing in a external circuit. We estimate the above parameters by means of assuming the exciton distribution due to concentration diffusion. We use naphthyl-substituted diamine derivative as a hole transport material and aluminum quioline as an emission material. The external quantum efficiency is enhanced from 0.92% to 1.1% by introducing hole-blocking layer. When the exciton distribution in steady state is assumed to be a simple exponential defined by the diffusion length, EL intensity can be calculated. By comparing the experimental value with the calculated value, we can estimate the range of the above parameters. |
| Starting Page | 461 |
| Ending Page | 464 |
| File Size | 234094 |
| Page Count | 4 |
| File Format | |
| ISBN | 9781424414819 |
| DOI | 10.1109/CEIDP.2007.4451531 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2007-10-14 |
| Publisher Place | Canada |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Excitons Organic light emitting diodes Radiative recombination Charge carrier processes Electrodes Organic materials Spontaneous emission Circuits Flat panel displays Aluminum |
| Content Type | Text |
| Resource Type | Article |
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