期刊
ACS NANO
卷 12, 期 9, 页码 9541-9548出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b05185
关键词
perovskite; in situ grown; quantum dots; LED; trap passivation; excitonic binding energy
类别
资金
- Natural Science Foundation of China [91733301, 61674109, 11675252, 11605278]
- National Key R&D Program of China [2016YFA0202400]
- Natural Science Foundation of Jiangsu Province [BK20130288]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Full inorganic cesium lead halide perovskites (IOPs) are regarded as attractive candidates for light-emitting diodes (LEDs) by their excellent luminescent conversion. However, unsatisfactory efficiency and stability are still the main drawbacks that hinder the commercialization progress of perovskite LEDs (PeLEDs). Here, we report an extremely uniform and flat CsPbBr3 film composing of self-assembly core-shell structured quantum dots (SCQDs) based on one-step precursor coating. The QDs size in the CsPbBr3 film is around 4.5 nm (smaller than the Bohr radius), which significantly confines injected carriers and leads to a ultrahigh exciton binding energy (E-b) of 198 meV. In addition, unfavorable surfacial defects are dramatically passivated by a thin surfacial-capping layer composed of long-chain ammonium groups (phenylalanine bromide, PPABr), resulting in an ultralow nonradiative recombination rate. Consequently, the CsPbBr3 SCQDs film presents a high photoluminescence quantum yield (PLQY) of 85%. It enables the resulting green PeLEDs to deliver a recorded external quantum efficiency (EQE) over 15% with ideal operational stability. Furthermore, the developed CsPbBr3 SCQDs film also demonstrates promising potential in multifunctional lighting sources such as flexible and smart devices.
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