Figures in paper 'Temperature dependence of the band gap of zinc nitride observed in photoluminescence measurements'

The figures included here are related to the publication:"Temperature
dependence of the band gap of zinc nitride observed in photoluminescence
measurements".Appl. Phys. Lett. 111, 122105 (2017); doi: http://dx.doi.org/10.1063/1.4997153The study reported in this paper was funded by the EPSRC (Fund code EP/M507611/1) and Johnson Matthey PLC. The financial support by these parties is highly appreciated.Figure 1: XRD pattern of a sample grown at 150 °C. Inset: SEM image of the same sample.Figure 2: Temperature dependent PL of a sample shortly after growth. The excitation power for these measurements was set to 30 mW.Figure 3:
(a) Temperature dependent PL of the zinc nitride sample after prolonged
exposure to ambient. (b) Comparison of the high-energy bands of the
same sample before (solid) and after (dashed) prolonged exposure to
ambient.Figure 4: PL spectra of bands A and B at (a) 3.7
and (b) 294 K at different excitation powers. (c) Peak intensities and
(d) emission energies of band A at 294 K (●) and bands A (▼) and B (▲)
at 3.7 K as a function of excitation power. The spectra in (a) have been
normalised at the maximum intensity of band A.Figure 5:
Temperature dependence of (a) relative integrated intensities (I/I0) and
(b) the emission energies of band A at an excitation power of 100 mW
(●) and bands A (▼) and B (▲) at an excitation power of 1 mW.

本集中所含图形与以下出版物相关：《锌氮化物光致发光测量中观察到的带隙温度依赖性》。发表于《应用物理快报》第111卷，第122105号（2017年）；DOI：http://dx.doi.org/10.1063/1.4997153。论文中报告的研究由EPSRC（基金代码EP/M507611/1）和Johnson Matthey PLC资助。对这些机构的财政支持深表感激。图1：在150°C下生长的样品的XRD图案。插图：同一样品的SEM图像。图2：生长后不久的样品的带隙温度依赖性PL。这些测量的激发功率设置为30 mW。图3：（a）长时间暴露于环境中的锌氮化物样品的带隙温度依赖性PL。（b）同一样品在长时间暴露于环境前（实线）和后（虚线）的带隙高能带比较。图4：在（a）3.7 K和（b）294 K下，不同激发功率下A和B带的PL光谱。（c）294 K下A带的峰值强度（●）以及A（▼）和B（▲）带在3.7 K下的发射能量作为激发功率的函数。（a）中的光谱已按A带的最高强度归一化。图5：在100 mW激发功率下（●）和1 mW激发功率下A（▼）和B（▲）带的相对积分强度（I/I0）和（b）发射能量的温度依赖性。