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BaCl 2 :Er 3+ —A High Efficient Upconversion Phosphor for Broadband Near‐Infrared Photoresponsive Devices
Author(s) -
Chen Zhi,
Jia Hong,
Zhang Xiaowen,
Liu Jianmin,
Zeng Shengfeng,
Li Yang,
Ma Zhijun,
Dong Guoping,
Qiu Jianrong
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13558
Subject(s) - photon upconversion , phosphor , materials science , optoelectronics , photocurrent , infrared , wavelength , amorphous solid , optics , doping , chemistry , physics , organic chemistry
Utilization of photons with subband‐gap energy, mostly near‐infrared (NIR) photons, is highly desirable for photovoltaic cells; which can be achieved by adding an upconversion layer at the rear face of photovoltaic cells. Here, we study the upconversion luminescence properties of BaCl 2 :Er 3+ phosphors and hexagonal NaYF 4 :Er 3+ phosphors upon excitation of incoherent NIR sunlight with wavelength λ > 800 nm. Higher efficacious upconversion emissions of BaCl 2 :Er 3+ phosphors have been observed in comparison with the well‐known hexagonal NaYF 4 :Er 3+ phosphors. We demonstrate that the photocurrent response from the thin‐film‐hydrogenated amorphous silicon solar cell attached with the BaCl 2 :Er 3+ phosphor is notably enhanced under irradiation of incoherent NIR sunlight with wavelength λ > 800 nm. This judicious design may be envisioned to shorten the distance for the remarkable improvement of the power conversion efficiency of the next‐generation photovoltaic cells and suggests a promising application for other NIR photoresponsive devices.