Led filament arrangement comprising light converting material

A light emitting diode, LED, filament configured to emit LED filament light comprising:

• a light transmissive carrier comprising a first major surface, and a second major surface arranged opposite to the first major surface,
• an array of a plurality of first LEDs arranged on the first major surface, wherein the plurality of first LEDs is configured to emit blue LED light having a peak emission wavelength within a wavelength range of 430-490 nm,
• a first elongated encapsulant at least partially covering the first major surface and at least partially enclosing the array of the plurality of first LEDs, wherein the first encapsulant comprises a first luminescent material configured to at least partly convert the emitted blue LED light into first converted light, wherein the first luminescent material comprises a green-yellow phosphor configured to at least partly convert the emitted blue LED light into second converted light comprising green-yellow light having a peak emission wavelength within a wavelength range of 500-600 nm, and
• a second elongated encapsulant at least partially covering the second major surface, comprising a second luminescent material, wherein at least 95 weight percent (w/w %) of the second luminescent material is M′zM2-2zAX6 doped with tetravalent manganese and wherein the second luminescent material is configured to at least partly convert the emitted blue LED light into fourth converted light comprising red light having a peak emission wavelength within a wavelength range of 600-650 nm;
• wherein M′ comprises an alkaline earth cation;
• wherein M comprises a cation, and z is in the range from 0 to 1;
• wherein A comprises a tetravalent cation;
• wherein X comprises at least one monovalent anion, the at least one monovalent anion comprising fluorine;
• wherein the luminescent material present in the second elongated encapsulant and comprising the second luminescent material is solely configured to generate light having a peak emission wavelength inside the wavelength range of 600-650 nm;
• and
• wherein the first luminescent material in the first encapsulant has a first concentration, C1, and the second luminescent material in the second encapsulant has a second concentration, C2, wherein C1>1.2·C2 is fulfilled.