Rare earth doped quantum dot material for solar cell light conversion and preparation thereof

Abstract

The invention belongs to the field of light conversion materials and discloses a rare earth doped quantum dot material for light conversion of solar cells and a preparation method of the rare earth doped quantum dot material. The rare earth doped quantum dot material with a chemical formula being CdSe:Yb3+ takes CdSe quantum dots as a substrate and doped Yb3+ as activation ions and is coated with a CdSe shell layer. The rare earth doped quantum dot material is obtained by a multi-step injection synthesis method, and by injection of octadecene suspension of Se powder for multiple times, the thin CdSe shell layer grows on the outer surface of quantum dots, defects of the Yb3+ doped quantum dots are reduced, and an original nonluminous sample is enabled to emit bright orange light. The obtained rare earth doped quantum dot material emits 640nm orange light under excitation of 800-1100nm light, light upconversion is realized, high light emitting efficiency is achieved, a foundation is laid for rare earth doped quantum dot related researches, and an important directive significance to design of efficient photoelectronic devices is achieved.

Description

technical field [0001] The invention belongs to the field of light conversion materials, in particular to a rare earth-doped quantum dot material for light conversion of solar cells and a preparation method thereof. Background technique [0002] With the increasingly severe energy problems and the rapid development of science and technology, solar cells, as a new type of energy conversion device, have attracted more and more attention. Harnessing the light is an effective way to improve the efficiency of solar cells, so research on upconversion materials that modulate the spectrum of sunlight is also increasingly extensive. [0003] Semiconductor quantum dots have multiple excellent properties such as adjustable emission spectrum, good photostability, wide excitation spectrum and narrow emission spectrum, and are popular research objects in the field of luminescent materials. The absence of metastable energy levels between the band gaps results in low two-photon absorption ...

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Problems solved by technology

but since Cd 2+ with Yb 3+ Large differences in ionic radii, mismatched charges, and large differences in the decomposition temperature of their precursor complexes during the synthesis of quantum dot solutions lead to Yb 3+ It is difficult to dope CdSe quantum dots or there are too many defects after a small amount of doping makes the luminous efficiency very low

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