Sintering temperature effect on structural and luminescence properties of 10mol% Y substituted Gd3Al5O12:Ce phosphors

Charge deformation and orbital hybridization: intrinsic mechanisms on tunable chromaticity of Y3Al5O12:Ce3+ luminescence by doping Gd3+ for warm white LEDs

“…In addition to efficiency, the chromaticity and thermal stability of the luminescence of the phosphor are crucial to white LED applications because changes in the emission colour and flux during operation as a result of heat released continuously from the p-n junction of LED chips are highly undesirable41519. This type of white light produced by mixing the yellow from YAG: Ce and the blue (450–460 nm) from InGaN chips, exhibits a cold colour temperature in addition to poor colour rendering ability1516171819202122, due to its deficiency in the red component in its emission spectrum. However, warm white is generally desired for indoor lighting.…”

“…However, warm white is generally desired for indoor lighting. To decrease the colour temperature, an appropriate amount of Gd 3+ usually is doped into YAG: Ce, the emission peak of which can be regulated from approximately 543 nm to maximum 575 nm by tailoring the Gd 3+ concentration until the collapse of crystal lattice1516171819202122. Nevertheless, the luminescence efficiency decreases and the thermal stability of luminescence deteriorate after doping Gd 3+ into YAG: Ce.…”

Luminescent properties of yellowish orange Y3Al5−xSixO12−xNx:Ce phosphors and their applications in warm white light-emitting diodes

“…Among these phosphors, cerium-doped yttrium aluminum garnet (Y 3 Al 5 O 12 :Ce 3+ , YAG:Ce) is the best choice. As excited by the blue radiation, it shows an efficient broad luminescence in yellow region, high quantum efficiency (QE, >90%), high chemical and photochemical stability [4][5][6][7][8]. Recent improvement of internal QE and light extraction of InGaN LEDs has resulted in record luminous efficiency of YAG:Ce phosphor based white LEDs far beyond 100 lm/W which is higher than that of compact fluorescent lamps (CFLs) and comparable to that of linear fluorescent lamps (LFLs) [9][10][11].…”

Enhancement of Red Emission in Aluminum Garnet Yellow Phosphors by Sb3+ Substitution for the Octahedral Site

“…I n recent years, white light‐emitting diodes (WLEDs) are the subject of increasing interest due to their benefits in terms of energy‐saving, reliability, maintenance, and safety 1–4 . The WLEDs are fabricated with InGaN blue LED chips and yellow phosphors such as Ce 3+ ‐doped yttrium aluminum garnet (Y 3 Al 5 O 12 :Ce 3+ ), Eu 2+ ‐doped oxynitrides, and Eu 2+ (/Ce 3+ )‐doped silicate‐based materials 5–7 …”

“…[1][2][3][4] The WLEDs are fabricated with InGaN blue LED chips and yellow phosphors such as Ce 31 -doped yttrium aluminum garnet (Y 3 Al 5 O 12 :Ce 31 ), Eu 21 -doped oxynitrides, and Eu 21 (/Ce 31 )doped silicate-based materials. [5][6][7] There are some possible drawbacks in the case of oxynitride yellow phosphors and having the good chromaticity and excellent thermal stability. 8,9 However, the synthesis of these materials can be more difficult than for typical oxide phosphors.…”