Journal
ADVANCED OPTICAL MATERIALS
Volume 7, Issue 2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201801336
Keywords
CsPbBr3; LO phonon; microspheres; pure green emission; reabsorption
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Funding
- NSFC [61674060]
- Fundamental Research Funds for the Central Universities, HUST [2017KFYXJJ030, 2017KFXKJC002, 2017KFXKJC003, 2018KFYXKJC016]
- National Young 1000 Talent Plan of China
- New Mexico EPSCoR [NSF-1301346]
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All-inorganic lead halide perovskites have been extensively studied in the past several years due to their superior stability against moisture, oxygen, light, and heat compared with their organic-inorganic counterparts. CsPbBr3 with suitable band gap and ultrahigh photoluminescence quantum yield is a promising candidate for pure green emitter in the backlighting display to fill the so-called green gap. Here, vapor-phase growth of CsPbBr3 microspheres is reported for highly efficient pure green light emission. The as-synthesized microspheres exhibit a stronger photoluminescence (PL) intensity with a photoluminescence quantum yield of 75% resulting from the lower energy of longitudinal optical phonons revealed by temperature dependent PL studies. Importantly, with the diameter increasing from 2 to 50 mu m the PL peak positions of the microspheres can be readily tuned from 527 to 539 nm, well filling the so-called green gap. The red-shift with increasing diameter can be ascribed to the reabsorption process during the photon propagation inside the microspheres. The studies provide a route to improve the photoluminescence quantum yield in all-inorganic lead halide perovskites, but also suggest an alternative approach to achieve the pure green emission for the backlighting display.
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