A light emitting device comprising: a luminescent element comprising a first face and a second face, the first face comprising a light input surface and one of the first face and the second face comprising a light exit surface, the luminescent element being adapted for receiving first light with a first spectral distribution emitted by at least one laser light source (21, 22, 23) at the light input surface, converting at least a part of the first light with the first spectral distribution to second light with a second spectral distribution, guiding the second light with the second spectral distribution to the light exit surface and coupling at least a part of the second light with the second spectral distribution out of the light exit surface, and a heat sink element arranged to be in thermal contact with at least a part of the luminescent element extending between the first face and the second face, wherein the first face comprises a cross-sectional area A and the luminescent element further comprises a length L being defined as the shortest distance between the first face and the second face and a characteristic length B of the cross sectional area A, the characteristic length B being defined as the square root of the cross sectional area A, and wherein the length L and the characteristic length B of the cross sectional area A are chosen such that they satisfy any one of the relations L / B ≥ 2 ∗ E lls / 44 W / mm 2 for λ THC < 6 W / mK, L / B ≥ 1.3 ∗ E lls / 44 W / mm 2 for 6 W / mK ≤ λ THC ≤ 8 W / mK, and L / B ≥ 0.85 ∗ E lls / 44 W / mm 2 for 8 W / mK < λ THC, where E lls is the irradiance of the at least one laser light sources measured in W/mm 2 and λ THC is the thermal heat coefficient of the luminescent element at room temperature, wherein the luminescent element comprises a dopant, and wherein the luminescent element and the heat sink element are connected by means of a bonding material, characterized in that the dopant concentration is chosen taking into account the length L of the luminescent element such that the absorption length of the first light with the first spectral distribution is such that 10% or less of the first light with the first spectral distribution remains after the first light with the first spectral distribution having travelled a path corresponding to the length L of the luminescent element, and in that the bonding material comprises scattering particles. a luminescent element comprising a first face and a second face, the first face comprising a light input surface and one of the first face and the second face comprising a light exit surface, the luminescent element being adapted for receiving first light with a first spectral distribution emitted by at least one laser light source (21, 22, 23) at the light input surface, converting at least a part of the first light with the first spectral distribution to second light with a second spectral distribution, guiding the second light with the second spectral distribution to the light exit surface and coupling at least a part of the second light with the second spectral distribution out of the light exit surface, and a heat sink element arranged to be in thermal contact with at least a part of the luminescent element extending between the first face and the second face, wherein the first face comprises a cross-sectional area A and the luminescent element further comprises a length L being defined as the shortest distance between the first face and the second face and a characteristic length B of the cross sectional area A, the characteristic length B being defined as the square root of the cross sectional area A, and wherein the length L and the characteristic length B of the cross sectional area A are chosen such that they satisfy any one of the relations L / B ≥ 2 ∗ E lls / 44 W / mm 2 for λ THC < 6 W / mK, L / B ≥ 1.3 ∗ E lls / 44 W / mm 2 for 6 W / mK ≤ λ THC ≤ 8 W / mK, and L / B ≥ 0.85 ∗ E lls / 44 W / mm 2 for 8 W / mK < λ THC, where E lls is the irradiance of the at least one laser light sources measured in W/mm 2 and λ THC is the thermal heat coefficient of the luminescent element at room temperature, wherein the luminescent element comprises a dopant, and wherein the luminescent element and the heat sink element are connected by means of a bonding material, characterized in that the dopant concentration is chosen taking into account the length L of the luminescent element such that the absorption length of the first light with the first spectral distribution is such that 10% or less of the first light with the first spectral distribution remains after the first light with the first spectral distribution having travelled a path corresponding to the length L of the luminescent element, and in that the bonding material comprises scattering particles.