Electroluminescence from a Mixed Red-Green-Blue Colloidal Quantum Dot Monolayer
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- 作者：Polina O. Anikeeva ; Jonathan E. Halpert ; Moungi G. Bawendi ; Vladimir Bulovi
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- 刊名：Nano Letters
- 出版年：2007
- 出版时间：August 2007
- 年：2007
- 卷：7
- 期：8
- 页码：2196 - 2200
- 全文大小：218K
- 年卷期：v.7,no.8(August 2007)
- ISSN：1530-6992
文摘
We demonstrate light emitting devices (LEDs) with a broad spectral emission generated by electroluminescence from a mixed-monolayer ofred, green, and blue emitting colloidal quantum dots (QDs) in a hybrid organic/inorganic structure. The colloidal QDs are reproducibly synthesizedand yield high luminescence efficiency materials suitable for LED applications. Independent processing of the organic charge transport layersand the QD luminescent layer allows for precise tuning of the emission spectrum without changing the device structure, simply by changingthe ratio of different color QDs in the active layer. Spectral tuning is demonstrated through fabrication of white QD-LEDs that exhibit externalquantum efficiencies of 0.36% (Commission Internationale de l'Eclairage) coordinates of (0.35, 0.41) at video brightness, and color renderingindex of 86 as compared to a 5500 K blackbody reference.