Details

Autor(en) / Beteiligte

• Chuang, Ching‐An
• Yu, Feng‐Han
• Yeh, Bo‐Xian
• Ummah, Anna Milatul
• Rosyadi, Adzilah Shahna
• Ho, Ching‐Hwa

Titel

Visible White‐Light Emission and Carrier Dynamics Observed in Full‐Series GaSe1‐xSx (0≤x≤1) Multilayers

Ist Teil von

• Advanced optical materials, 2023-12, Vol.11 (23), p.n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2023

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• Near‐band‐edge emissions ranging from red (≈630 to 602 nm) to green (≈550 to 534 nm) and blue (≈494 to 480 nm) colors have been detected in full‐series GaSe1‐xSx (0≤x≤1) multilayers using micro‐photoluminescence (µPL) measurements from 4 to 300 K. The multilayered chalcogenides crystallize in a hexagonal structure, with observed mixed stacking phases of ε and β polymorphs through X‐ray diffraction and Raman measurements. The µPL results, along with experimental band‐edge characterization through thermoreflectance, identify the ε‐stacked phase as the crucial phase responsible for direct recombination and the emission of free excitons within the visible range. A mixed‐color white light is created by PL, which is emitted from the layered GaSe1‐xSx series of different colors, and is positioned at the center of the CIE coordination plot (i.e., white color). To assess the emission properties of both band edges and defects in the layered compounds, time‐resolved photoluminescence (TRPL) is employed, using an area mapping function. The photoluminescence decay lifetime increases as the sulfur content is increased, owing to the greater occurrence of mixed‐phase stacking faults near the β‐GaS end within the GaSe1‐xSx (0≤x≤1) series. The multilayer GaSe1‐xSx (0≤x≤1) represents a distinct 2D chalcogenide series well‐suited for emitting full‐color visible light. Band‐edge emissions from red (R≈623 nm) and green (G≈550 nm) to purple (B≈480 nm) are observed by successively altering the S composition from x = 0 to x = 1 in the multilayer GaSe1‐xSx series and are detected by micro‐photoluminescence (µPL) experiments. A visible white light that centered at the CIE coordinate is also created by combining the PL emitted lights from the various chalcogenides layers of the crystal series.