The best replacement for emitter is common collector.

The best alternatives to emitter are rated as following:
★★★★★  common collector
★★★  collector
★★★  common base
★★  dlp link
★★  open collector
★★  pulse gun
★★  input characteristics
  poor emitter
  ir blaster

Your alternative for emitter is not listed? Suggest!
Speaking about emitter, one probably shouldn't forget about 3d glass.

Other search terms related to emitter and their ratings are:
★★★★★ 3d glass
You have in mind a companion for emitter and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of emitter in all years. Click on graph for more.
emitter
common collector
collector