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Related Concept Videos

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.

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Ultrabroad Near Infrared Emitting Perovskites.

Sajid Saikia1, Animesh Gopal2, Radha Rathod3

  • 1Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, 411008, India.

Angewandte Chemie (International Ed. in English)
|September 20, 2024
PubMed
Summary
This summary is machine-generated.

New ultrabroad near-infrared (NIR) emitting phosphors were developed for phosphor converted light emitting diodes (pc-LEDs). These novel materials enable advanced NIR imaging applications with enhanced performance and stability.

Keywords:
Near InfraredPerovskiteUltrabroad Emissiond–d transitionspc-LED

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Area of Science:

  • Materials Science
  • Solid-State Lighting
  • Photonics

Background:

  • Phosphor converted light emitting diodes (pc-LEDs) have replaced incandescent lamps for energy-efficient lighting.
  • Developing pc-LEDs that emit ultrabroad near-infrared (NIR) radiation is challenging due to a lack of suitable phosphors.

Purpose of the Study:

  • To synthesize and characterize novel ultrabroad NIR emitting phosphors for advanced pc-LED applications.
  • To investigate the photoluminescence properties and potential applications of these new materials.

Main Methods:

  • Synthesis of W4+-doped and Mo4+-doped Cs2Na0.95Ag0.05BiCl6 perovskites.
  • Characterization of photoluminescence spectra, spectral widths, and quantum yields.
  • Fabrication of 3D printed pc-LED panels using a composite of phosphors and polylactic acid.

Main Results:

  • Achieved ultrabroad NIR emission with spectral widths of 434 nm (W4+-doped) and 468 nm (Mo4+-doped).
  • Observed broad self-trapped exciton (STE) emission in the NIR-I region and dopant d-d transitions in the NIR-II region (~950 nm).
  • Demonstrated NIR photoluminescence quantum yields up to ~40% and fabricated robust, thermally stable 3D printed pc-LED panels.

Conclusions:

  • The developed ultrabroad NIR phosphors show significant potential for next-generation pc-LEDs.
  • The ability to 3D print these materials opens avenues for customized NIR lighting and imaging solutions.
  • These phosphors advance the field of solid-state lighting and NIR technology.