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Emission Spectra

Emission Spectra

When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.

Photoluminescence: Applications

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Updated: Jun 16, 2026

Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes

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Published on: November 15, 2016

Single-Grain High-Efficiency Full-Visible-Spectrum White Emitters.

Shuifu Liu^1,2, Xianfeng Yang³, Rongkai Du¹

¹Zhuhai Key Laboratory of Optoelectronic Functional Materials and Membrane Technology/School of Chemical Engineering and Technology/School of Marine Sciences, Sun Yat-sen University, Zhuhai, Guangdong, 519082, China.

Angewandte Chemie (International Ed. in English)

|February 28, 2025

Summary

This summary is machine-generated.

Researchers developed novel single-grain phosphors for efficient full-visible-spectrum white light-emitting diodes (WLEDs). This breakthrough enhances luminescence efficiency, paving the way for healthier and advanced lighting solutions.

Keywords:

Full‐visible‐spectrum emission Healthy lighting High luminescence efficiency Single‐grain phosphors Versatile luminescent materials

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Area of Science:

Materials Science
Solid-State Lighting
Luminescent Materials

Background:

Full-visible-spectrum emission phosphors offer a cost-effective alternative to traditional mixed phosphors for white light-emitting diodes (WLEDs).
A key limitation hindering their widespread adoption is suboptimal luminescence efficiency.

Purpose of the Study:

To develop a generalized strategy for enhancing the luminescence efficiency of full-visible-spectrum phosphors.
To investigate the potential of heterostructure interfaces in mitigating detrimental energy transfer processes.
To synthesize and characterize novel single-grain phosphors for advanced WLED applications.

Main Methods:

A generalization strategy involving the creation of heterostructure interfaces was employed.
SrLiPO₄/Sr₉MgLi(PO₄)₇:Eu²⁺ single-grain phosphors were synthesized.
Characterization of luminescence efficiency, including internal and external quantum efficiencies, was performed.

Main Results:

The synthesized SrLiPO₄/Sr₉MgLi(PO₄)₇:Eu²⁺ phosphors demonstrated remarkable full-visible-spectrum emission.
Record internal quantum efficiency of 76.1% and external quantum efficiency of 56.2% were achieved.
WLEDs utilizing these phosphors exhibited a high color rendering index (≈93.9), low correlated color temperature (≈3100 K), and stable color performance.

Conclusions:

The developed heterostructure strategy effectively boosts phosphor efficiency by preventing detrimental energy transfer.
The synthesized single-grain phosphors are highly suitable for healthy, full-visible-spectrum lighting applications.
This work is expected to advance full-visible-spectrum phosphor technology and inspire the development of novel luminescent materials.