Inorganic Halide Perovskites for Efficient Light-Emitting Diodes

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• 作者：Natalia Yantara ; Saikat Bhaumik ; Fei Yan ; Dharani Sabba ; Herlina A. Dewi ; Nripan Mathews ; Pablo P. Boix ; Hilmi Volkan Demir ; Subodh Mhaisalkar
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：November 5, 2015
• 年：2015
• 卷：6
• 期：21
• 页码：4360-4364
• 全文大小：400K
• ISSN：1948-7185

文摘

Lead-halide perovskites have transcended photovoltaics. Perovskite light-emitting diodes (PeLEDs) emerge as a new field to leverage on these fascinating semiconductors. Here, we report the first use of completely inorganic CsPbBr₃ thin films for enhanced light emission through controlled modulation of the trap density by varying the CsBr-PbBr₂ precursor concentration. Although pure CsPbBr₃ films can be deposited from equimolar CsBr-PbBr₂ and CsBr-rich solutions, strikingly narrow emission line (17 nm), accompanied by elongated radiative lifetimes (3.9 ns) and increased photoluminescence quantum yield (16%), was achieved with the latter. This is translated into the enhanced performance of the resulting PeLED devices, with lower turn-on voltage (3 V), narrow electroluminescence spectra (18 nm) and higher electroluminescence intensity (407 Cd/m²) achieved from the CsBr-rich solutions.