Light-emitting diode filament structure and LED lighting lamp including the same

An LED lighting lamp with an LED filament structure, said LED filament structure comprising:

• a substrate;
• an LED chip unit disposed on said substrate, and including at least one first LED chip and at least one second LED chip, said at least one first and second LED chips being spaced apart from each other and emit first and second excitation lights, respectively, having different emission peak wavelengths, wherein each of said at least one first and second LED chips has an exposed surface devoid of a contact with said substrate;
• a first chromic layer covering said exposed surfaces of one of said at least one first LED chip and said at least one second LED chip and being in direct contact therewith;
• and
• a light conversion layer disposed on and covering said LED chip unit and said first chromic layer, said light conversion layer including a light conversion material,
• wherein said first chromic layer is configured to transition between an inactivated state and an activated state;
• and
• wherein, in the inactivated state, said first chromic layer prevents the excitation light emitted from said one of said at least one first and said at least one second LED chips from passing therethrough, and the excitation light emitted from the other one of said at least one first and said at least one second LED chips passes through said light conversion layer and excites said light conversion material to emit a first excited light, and
• in the activated state, said first chromic layer allows the excitation light emitted from said one of said at least one first and said at least one second LED chips to pass therethrough, and the excitation lights emitted from said at least one first and said at least one second LED chips passes through said light conversion layer and excites said light conversion material to obtain a second excited light having a color temperature different from that of said first excited light.