A search for extra-high brightness laser-driven color converters by investigating thermally-induced luminance saturation

Abstract

Clarification of thermal saturation helps to guide the design of high-brightness yellow and green components for laser lighting and displays.

YAG:Ce3+ Transparent Ceramic Phosphors Brighten the Next‐Generation Laser‐Driven Lighting

“…[25] The traditional encapsulated technique is dispersing YAG:Ce 3+ phosphors in organic binders that have a lower heat resistance and thermal conductivity (0.1-0.4 W m −1 K −1 ). [26] To overcome the thermal effect induced by the high-power density of blue LDs, remote encapsulations of single-crystal phosphors (SCPs), [27][28][29] phosphor in glasses (PiGs), [30][31][32][33] and transparent ceramic phosphors (TCPs) [11,22,[34][35][36][37][38] are proposed. The TCP is most promising type due to its lower cost and higher thermal conductivity than the SCP and PiG type.…”

High Efficiency Green‐Emitting LuAG:Ce Ceramic Phosphors for Laser Diode Lighting

“…[ 29–31 ] LuAG:Ce CPs are regarded as the best type that is robust irradiated by high‐power LD light (15–25 W, up to 49 W mm −2 ). [ 32–36 ] The luminous efficacy (LE) of LuAG:Ce CPs in LD lighting has been greatly enhanced from about 54 to 205 lm W −1 by designing geometric structures and introducing scattering centers. [ 32–37 ]…”

“…[29][30][31] LuAG:Ce CPs are regarded as the best type that is robust irradiated by high-power LD light (15-25 W, up to 49 W mm −2 ). [32][33][34][35][36] The luminous efficacy (LE) of LuAG:Ce CPs in LD lighting has been greatly enhanced from about 54 to 205 lm W −1 by designing geometric structures and introducing scattering centers. [32][33][34][35][36][37] However, LuAG CPs are usually sintered higher than 1700 °C, SiO 2 or TEOS is commonly added as sintering aid.…”

“…[32][33][34][35][36] The luminous efficacy (LE) of LuAG:Ce CPs in LD lighting has been greatly enhanced from about 54 to 205 lm W −1 by designing geometric structures and introducing scattering centers. [32][33][34][35][36][37] However, LuAG CPs are usually sintered higher than 1700 °C, SiO 2 or TEOS is commonly added as sintering aid. [32][33][34] SiO 2 begins to react with the garnets at about 1400 °C, [38] and defects are inevitable due to the size and charge mismatches between Si 4+ and Lu 3+ /Al 3+ .…”

“…[32][33][34][35][36][37] However, LuAG CPs are usually sintered higher than 1700 °C, SiO 2 or TEOS is commonly added as sintering aid. [32][33][34] SiO 2 begins to react with the garnets at about 1400 °C, [38] and defects are inevitable due to the size and charge mismatches between Si 4+ and Lu 3+ /Al 3+ . [39] The defects decline the thermal stability that is directly related with the performance of LuAG:Ce in LD lighting.…”