The present invention refers to a device (112) for monitoring an emission temperature of at least one radiation emitting element (114), a heating system (110) for heating at the least one radiation emitting element (114) to emit thermal radiation at an emission temperature, a method for monitoring an emission temperature of at least one radiation emitting element (114) and method for heating the at least one radiation emitting element (114) to emit thermal radiation at an emission temperature. Herein, the device (112) for monitoring an emission temperature of at least one radiation emitting element (114) comprises—at least one light source (125), wherein the light source is configured to emit optical radiation at least partially towards the at least one radiation emitting element (114); —at least one radiation sensitive element (126), wherein the at least one radiation sensitive element (126) has at least one sensor region (128), wherein the at least one sensor region (128) comprises at least one photosensitive material selected from at least one photoconductive material, wherein the at least one sensor region (128) is designated for generating at least one sensor signal depending on an intensity of the thermal radiation emitted by the at least one radiation emitting element (114) and received by the sensor region (128) within at least one wavelength range, wherein the sensor region (128) is further designated for generating at least one further sensor signal depending on an intensity of the optical radiation emitted by the at least one light source (125) and received by the sensor region (128) within at least one further wavelength range, wherein the at least one radiation sensitive element (126) is arranged in a manner that the thermal radiation travels through at least one transition material (116) prior to being received by the at least one radiation sensitive element (126), wherein at least one of the at least one light source (125) and the at least one radiation sensitive element (126) is arranged in a manner that the optical radiation travels through the at least one transition material (116) and impinges the at least one radiation emitting element (114) prior to being received by the at least one radiation sensitive element (126); and—at least one evaluation unit (138), wherein the at least one evaluation unit (138) is configured to determine the emission temperature of the at least one radiation emitting element (114) by using values for the intensity of the thermal radiation and the optical radiation.