Efficient thermal and luminescent regulations of LuAG: Ce-PiG based remote LED/LD

The quantum loss in phosphor-in-glass (PiG) and energy loss in LD/LED exciting source could aggravate the thermal load of a glass-based luminescence device. In this study, luminous efficiency of radiation (LER) and thermal shock in LuAG: Ce PiG-based remote LD/LED prototypes were regulated effectively, by controlling the exciting distance between PiG and blue LD/LED. For remote LD, both the simulated temperature and the real working temperature of LuAG: Ce-PiG were initially increased and then declined with increase of the exciting distance (the numerical difference: 9.3%). The maximum working temperature of LuAG: Ce-PiG was 135.1 °C. Remarkably, LER of LuAG: Ce-PiG was initially reduced and then elevated with increase of the exciting distance, and the obtained maximum LER was 203.97 lm/W. Meanwhile, increasing the working distance leads to the decrease of both LER and working temperature of the PiG based LED, since the excitation loss was negatively correlated to the exciting distance. For the better application of LD/LED device in high power lighting and display, this work strictly controlling exciting distance is highly necessary.