A red and near-infrared emitting rare earth-based phosphor

Bi2Er(1-x)O4Cl:xB phosphor was prepared by a high-temperature solid-state method, achieving single-band red light and near-infrared II emission. This solves the problem of reduced luminescence intensity of existing materials at high temperatures and is suitable for biomedical imaging.

CN119752445BActive Publication Date: 2025-11-18KUNMING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411926549.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-11-18
Estimated Expiration
2044-12-25

AI Technical Summary

Technical Problem

Existing rare-earth upconversion luminescent materials have difficulty achieving single red and near-infrared emission in the biomedical field, and their luminescence intensity weakens under high-temperature conditions, limiting their application in bioimaging and photodynamic therapy.

Method used

Bi2Er(1-x)O4Cl:xB phosphor was prepared by a high-temperature solid-state method, in which Er3+ ions were used as the matrix material and alkali metals were added to regulate the crystal field, achieving single-band red light and near-infrared II emission, and maintaining stability at high temperature.

Benefits of technology

It achieves single-band red light emission and near-infrared II emission under visible light, with a 3.2-fold increase in luminescence intensity, a wide emission range, and stable luminescence at high temperatures, making it suitable for biomedical imaging.

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Abstract

The application discloses a red and near-infrared emission rare earth-based fluorescent powder and belongs to the technical field of luminescent materials. The application adopts a high-temperature solid-phase method to prepare the red and near-infrared emission rare earth-based fluorescent powder, and the chemical formula is Bi2Er (1‑x) O4Cl:xB; wherein 0.01<=x<=0.1; the element B is one of Li, Na and K. 3+ The element Er 3+ serves as a sensitized ion and a luminescent center ion. Different from a general up-conversion luminescent system which has multi-band emission in visible light, the red and near-infrared emission rare earth-based fluorescent powder has single-band red light emission in visible light, the luminescence is enhanced by 3.2 times, the emission range is wide, and the emission band covers a red light region of 630nm-730nm and a near-infrared region of 1500nm-1600nm. The near-infrared region has strong emission and thermal stability. In addition, the red and near-infrared emission rare earth-based fluorescent powder has low biological toxicity.
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