Something like this?
\documentclass[10pt,a4paper]{article}\usepackage[utf8]{inputenc}\usepackage[T1]{fontenc}\usepackage{mathtools,amssymb}\begin{document}\[\setlength\arraycolsep{2.5pt} % default value: 5ptJ(\widehat{\Phi})(p)=\begin{pmatrix}\bigl((\widehat{\Phi}(p)^{}_{ij})\bigr)_{i,j=1}^r &\dots &\dots & \dots & \bigl((\widehat{\Phi}(p)^{}_{ij})\bigr)_{i,j=1}^r \\& \ddots & \vdots & & \vdots\\& &\bigl((\partial^{\alpha}\partial^{\beta}\widehat{\Phi}(p)^{}_{ij})\bigr)_{i,j=1}^r & & \vdots \\& & & \ddots & \vdots \\ \hbox{\huge0} & & & & \bigl((\partial_d^{k-1}\widehat{\Phi}(p)^{}_{ij})\bigr)_{i,j=1}^r\end{pmatrix}\]\end{document}