Luminescent material including hole and electron traps and an apparatus including such material

A luminescent material comprising:

• an element or an interstitial site that provides a hole trap in the luminescent material;
• a first dopant that provides a first electron trap in the luminescent material;
• and
• a second dopant that provides a second electron trap in the luminescent material,
• wherein the second dopant is a relatively shallower electron trap as compared to the first electron trap,
• wherein a ratio of the first dopant to the second dopant in the luminescent material is in a range of 10:1 to 100:1 on an atomic basis, and wherein the luminescent material is not a rare earth halide.

A luminescent material comprising:

• an element or an interstitial site that provides a hole trap in the luminescent material;
• a first dopant that provides a first electron trap in the luminescent material;
• and
• a second dopant that provides a second electron trap in the luminescent material,
• wherein the second dopant is a relatively shallower electron trap as compared to the first electron trap, wherein the first dopant includes a Group 1 element, Mg, or Ba, and the second dopant includes Ca or Sr, and wherein a ratio of the first dopant to the second dopant in the luminescent material is in a range of 10:1 to 100:1 on an atomic basis, and wherein the luminescent material is not a rare earth halide.