All-inorganic metal halide perovskites are widely studied because of their excellent photoelectric properties. However, due to the toxicity of CsPbX3 (X = Cl, Br, I) perovskites, it is difficult to...

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The photoluminescence spectra of Ca2La2.85−x(SiO4)3F:0.15Tb3+,xSm3+ phosphors (left) could emit typical multicolor light with increasing doping contents of samarium (right).

Social security expenditure is affected by many factors. According to the ' the flypaper effect ' and public choice theory, it can be concluded that the high financial transfer payment of the superior government will expand the local fiscal expenditure, and the local governments have the motivation to increase fiscal expenditure in order to obtain more transfer payments. However, if different fiscal expenditure items are considered, such as social security expenditure, this effect may change. In this regard, this paper uses fiscal autonomy to express the dependence of local governments on superior transfer payments, and selects panel data from 2009 to 2018 to empirically test the social security expenditure of 31 provinces in China. The results show that fiscal autonomy has a negative impact on social security expenditure, but this impact is not particularly large. The social security expenditure of a province is mainly related to local economic development level, aging degree, unemployment rate and other factors.