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We have determined the electron-coupling spectrum of superconductingBi2Sr2CaCu2O8+d from high-resolution angle-resolved photoemission spectra bytwo deconvolution-free robust methods. As hole concentration decreases, thecoupling spectral weight at low energies ~<15 meV shows a twofold and nearlyband-independent enhancement, while that around ~65 meV increases moderately,and that in ~>130 meV decreases leading to a crossover of dominant couplingexcitation between them. Our results suggest the competition among multiplescreening effects, and provide important clues to the source of sufficientlystrong low-energy coupling, {\lambda}LE ~ 1, in underdoped system.

Energy-Dependent Enhancement of the Electron-Coupling Spectrum of the Underdoped Bi2Sr2CaCu2O8+d Superconductor