Light-emitting diode lighting device

A light-emitting diode (LED) lighting device, comprising:

• a substrate having at least one first recess and at least one second recess therein, wherein the first recess has a bottom surface and at least one tapered side surface adjacent to the bottom surface, and the substrate is made of one piece of material;
• at least one first bottom electrode disposed in the first recess, wherein the first bottom electrode is reflective and covers at least a part of the bottom surface and at least a part of the tapered side surface;
• at least one first vertical LED disposed in the first recess and on the first bottom electrode;
• at least one second vertical LED disposed in the first recess and on the first bottom electrode;
• a first bottom transparent isolation layer disposed in the first recess, wherein the first bottom transparent isolation layer has a first opening and a second opening therein to respectively expose at least a part of the first vertical LED and at least a part of the second vertical LED;
• a first top transparent electrode electrically connected to the first vertical LED through the first opening;
• a second top transparent electrode electrically connected to the second vertical LED through the second opening, wherein the first top transparent electrode, the second top transparent electrode, and the first bottom electrode cooperate to electrically connect the first vertical LED and the second vertical LED in series;
• a second bottom electrode disposed in the second recess;
• at least one third vertical LED disposed in the second recess and on the second bottom electrode;
• and
• a second bottom transparent isolation layer disposed in the second recess, wherein the second bottom transparent isolation layer has a third opening therein to expose at least a part of the third vertical LED, wherein the second top transparent electrode is further electrically connected to the third vertical LED through the third opening, and the first bottom electrode, the second top transparent electrode, and the second bottom electrode cooperate to electrically connect the second vertical LED and the third vertical LED in series.