Light-emitting module and light-emitting device

A light-emitting device, comprising:

• a light-emitting module, comprising:
• a substrate, having a first surface, a second surface, and at least one through hole, wherein the first surface is relative to the second surface, and the at least one through hole penetrates through the first surface and the second surface;
• at least one conductive pillar, disposed in the at least one through hole, wherein each conductive pillar of the at least one conductive pillar comprises:
• a first portion, comprising a first metal;
• and
• a second portion and a third portion, respectively connected to two ends of the first portion, wherein the second portion and the third portion comprise an alloy, the alloy comprises a second metal and a third metal, and the second metal and the third metal are different from the first metal;
• an internal pad, disposed on the first surface of the substrate and connected to the second portion of the each conductive pillar;
• a light-emitting element, disposed on the internal pad and electrically connected to the internal pad, wherein the internal pad is located between the light-emitting element and the first surface of the substrate;
• and
• an external pad, disposed on the second surface of the substrate and connected to the third portion of the each conductive pillar;
• and
• an optical component, wherein the light-emitting element of the light-emitting module is configured to emit an illumination beam, and the optical component is disposed on a transmission path of the illumination beam.